18.04 gnome desktop random freezes












4














I am using 18.04 few months and about every 2 days, there is random GUI freeze. It already happened during web browsing, coding as well as watching movie so I guess that it is not application issue. It freezes completely including cursor. I checked syslog and kernlog without any clues (last message is usually few mins before crash). Any recommendations to find out whats wrong? Atm I would appreciate any error message..



GPU: AMD HD7970
Driver: Mesa 18.0.5
CPU: Ryzen 5



Thanks



Edit: running apt-get update aprox once per week.



Edit2: apt list --installed | grep 'gnome|extension|shell'



compiz-gnome/bionic,now 1:0.9.13.1+18.04.20180302-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomebluetooth-1.0/bionic,now 3.28.0-2 amd64 [installed,automatic]
gir1.2-gnomedesktop-3.0/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomekeyring-1.0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
gnome-accessibility-themes/bionic,bionic,now 3.28-1ubuntu1 all [installed]
gnome-bluetooth/bionic,now 3.28.0-2 amd64 [installed]
gnome-calculator/bionic,now 1:3.28.1-1ubuntu1 amd64 [installed]
gnome-calendar/bionic-proposed,now 3.28.2-0ubuntu0.18.04.1 amd64 [installed,automatic]
gnome-control-center/bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-control-center-data/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-control-center-faces/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-desktop3-data/bionic-proposed,bionic-proposed,now 3.28.2-0ubuntu1 all [installed,automatic]
gnome-disk-utility/bionic,now 3.28.1-0ubuntu1 amd64 [installed]
gnome-font-viewer/bionic,now 3.28.0-1 amd64 [installed]
gnome-getting-started-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-initial-setup/bionic-proposed,now 3.28.0-2ubuntu6.16.04.1 amd64 [installed,automatic]
gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
gnome-keyring-pkcs11/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-mahjongg/bionic,now 1:3.22.0-3 amd64 [installed,automatic]
gnome-menus/bionic,now 3.13.3-11ubuntu1 amd64 [installed]
gnome-mines/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-online-accounts/bionic-proposed,now 3.28.0-0ubuntu2.1 amd64 [installed,automatic]
gnome-orca/bionic,bionic,now 3.28.0-3ubuntu1 all [installed,automatic]
gnome-power-manager/bionic,now 3.26.0-1 amd64 [installed]
gnome-screensaver/bionic,now 3.6.1-8ubuntu3 amd64 [installed]
gnome-screenshot/bionic,now 3.25.0-0ubuntu2 amd64 [installed]
gnome-session-bin/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-session-canberra/bionic,now 0.30-5ubuntu1 amd64 [installed]
gnome-session-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu3 all [installed,automatic]
gnome-settings-daemon/bionic,now 3.28.1-0ubuntu1 amd64 [installed,automatic]
gnome-settings-daemon-schemas/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-shell/bionic,now 3.28.1-0ubuntu2 amd64 [installed,automatic]
gnome-shell-common/bionic,bionic,now 3.28.1-0ubuntu2 all [installed,automatic]
gnome-shell-extension-appindicator/bionic,bionic,now 18.04.1 all [installed,automatic]
gnome-shell-extension-ubuntu-dock/bionic,bionic,now 0.9.1 all [installed,automatic]
gnome-software/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-software-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu4.18.04.1 all [installed,automatic]
gnome-software-plugin-snap/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-startup-applications/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-sudoku/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-system-log/bionic,now 3.9.90-5 amd64 [installed]
gnome-system-monitor/bionic-updates,now 3.28.2-0ubuntu1 amd64 [installed]
gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed]
gnome-terminal-data/bionic-proposed,bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 all [installed,automatic]
gnome-themes-extra/bionic,now 3.28-1ubuntu1 amd64 [installed,automatic]
gnome-themes-extra-data/bionic,bionic,now 3.28-1ubuntu1 all [installed,automatic]
gnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
gnome-todo-common/bionic,bionic,now 3.28.1-1 all [installed,automatic]
gnome-user-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-guide/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-share/bionic,now 3.18.3-3 amd64 [installed,automatic]
gnome-video-effects/bionic,bionic,now 0.4.3-1ubuntu1 all [installed,automatic]
language-pack-gnome-cs/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-cs-base/bionic,bionic,now 1:18.04+20180423 all [installed,automatic]
language-pack-gnome-en/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-en-base/bionic,bionic,now 1:18.04+20180423 all [installed]
language-selector-gnome/bionic-updates,bionic-updates,now 0.188.1 all [installed,automatic]
libgnome-autoar-0-0/bionic,now 0.2.3-1 amd64 [installed,automatic]
libgnome-bluetooth13/bionic,now 3.28.0-2 amd64 [installed,automatic]
libgnome-desktop-3-17/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
libgnome-games-support-1-3/bionic,now 1.4.1-1 amd64 [installed,automatic]
libgnome-games-support-common/bionic,bionic,now 1.4.1-1 all [installed,automatic]
libgnome-keyring-common/bionic,bionic,now 3.12.0-1build1 all [installed,automatic]
libgnome-keyring0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
libgnome-menu-3-0/bionic,now 3.13.3-11ubuntu1 amd64 [installed,automatic]
libgnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
libgnomekbd-common/bionic,bionic,now 3.26.0-3 all [installed,automatic]
libgnomekbd8/bionic,now 3.26.0-3 amd64 [installed,automatic]
libnautilus-extension1a/bionic,now 1:3.26.3-0ubuntu4 amd64 [installed,automatic]
libpam-gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
libreoffice-gnome/bionic,now 1:6.0.3-0ubuntu1 amd64 [installed]
libsoup-gnome2.4-1/bionic,now 2.62.1-1 amd64 [installed,automatic]
nautilus-extension-gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed,automatic]
network-manager-gnome/bionic,now 1.8.10-2ubuntu1 amd64 [installed]
network-manager-pptp-gnome/bionic,now 1.2.6-1 amd64 [installed]
pinentry-gnome3/bionic,now 1.1.0-1 amd64 [installed,automatic]
policykit-1-gnome/bionic,now 0.105-6ubuntu2 amd64 [installed,automatic]
thunderbird-gnome-support/bionic-updates,bionic-security,now 1:52.8.0+build1-0ubuntu0.18.04.1 amd64 [installed,automatic]









share|improve this question
























  • have you installed some additional video driver ?
    – cmak.fr
    Jun 18 '18 at 18:53










  • I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
    – bigless
    Jun 18 '18 at 18:55










  • Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
    – cmak.fr
    Jun 18 '18 at 19:00








  • 1




    does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
    – cmak.fr
    Jun 18 '18 at 19:52






  • 3




    It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
    – heynnema
    Jun 19 '18 at 13:37
















4














I am using 18.04 few months and about every 2 days, there is random GUI freeze. It already happened during web browsing, coding as well as watching movie so I guess that it is not application issue. It freezes completely including cursor. I checked syslog and kernlog without any clues (last message is usually few mins before crash). Any recommendations to find out whats wrong? Atm I would appreciate any error message..



GPU: AMD HD7970
Driver: Mesa 18.0.5
CPU: Ryzen 5



Thanks



Edit: running apt-get update aprox once per week.



Edit2: apt list --installed | grep 'gnome|extension|shell'



compiz-gnome/bionic,now 1:0.9.13.1+18.04.20180302-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomebluetooth-1.0/bionic,now 3.28.0-2 amd64 [installed,automatic]
gir1.2-gnomedesktop-3.0/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomekeyring-1.0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
gnome-accessibility-themes/bionic,bionic,now 3.28-1ubuntu1 all [installed]
gnome-bluetooth/bionic,now 3.28.0-2 amd64 [installed]
gnome-calculator/bionic,now 1:3.28.1-1ubuntu1 amd64 [installed]
gnome-calendar/bionic-proposed,now 3.28.2-0ubuntu0.18.04.1 amd64 [installed,automatic]
gnome-control-center/bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-control-center-data/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-control-center-faces/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-desktop3-data/bionic-proposed,bionic-proposed,now 3.28.2-0ubuntu1 all [installed,automatic]
gnome-disk-utility/bionic,now 3.28.1-0ubuntu1 amd64 [installed]
gnome-font-viewer/bionic,now 3.28.0-1 amd64 [installed]
gnome-getting-started-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-initial-setup/bionic-proposed,now 3.28.0-2ubuntu6.16.04.1 amd64 [installed,automatic]
gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
gnome-keyring-pkcs11/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-mahjongg/bionic,now 1:3.22.0-3 amd64 [installed,automatic]
gnome-menus/bionic,now 3.13.3-11ubuntu1 amd64 [installed]
gnome-mines/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-online-accounts/bionic-proposed,now 3.28.0-0ubuntu2.1 amd64 [installed,automatic]
gnome-orca/bionic,bionic,now 3.28.0-3ubuntu1 all [installed,automatic]
gnome-power-manager/bionic,now 3.26.0-1 amd64 [installed]
gnome-screensaver/bionic,now 3.6.1-8ubuntu3 amd64 [installed]
gnome-screenshot/bionic,now 3.25.0-0ubuntu2 amd64 [installed]
gnome-session-bin/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-session-canberra/bionic,now 0.30-5ubuntu1 amd64 [installed]
gnome-session-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu3 all [installed,automatic]
gnome-settings-daemon/bionic,now 3.28.1-0ubuntu1 amd64 [installed,automatic]
gnome-settings-daemon-schemas/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-shell/bionic,now 3.28.1-0ubuntu2 amd64 [installed,automatic]
gnome-shell-common/bionic,bionic,now 3.28.1-0ubuntu2 all [installed,automatic]
gnome-shell-extension-appindicator/bionic,bionic,now 18.04.1 all [installed,automatic]
gnome-shell-extension-ubuntu-dock/bionic,bionic,now 0.9.1 all [installed,automatic]
gnome-software/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-software-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu4.18.04.1 all [installed,automatic]
gnome-software-plugin-snap/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-startup-applications/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-sudoku/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-system-log/bionic,now 3.9.90-5 amd64 [installed]
gnome-system-monitor/bionic-updates,now 3.28.2-0ubuntu1 amd64 [installed]
gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed]
gnome-terminal-data/bionic-proposed,bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 all [installed,automatic]
gnome-themes-extra/bionic,now 3.28-1ubuntu1 amd64 [installed,automatic]
gnome-themes-extra-data/bionic,bionic,now 3.28-1ubuntu1 all [installed,automatic]
gnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
gnome-todo-common/bionic,bionic,now 3.28.1-1 all [installed,automatic]
gnome-user-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-guide/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-share/bionic,now 3.18.3-3 amd64 [installed,automatic]
gnome-video-effects/bionic,bionic,now 0.4.3-1ubuntu1 all [installed,automatic]
language-pack-gnome-cs/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-cs-base/bionic,bionic,now 1:18.04+20180423 all [installed,automatic]
language-pack-gnome-en/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-en-base/bionic,bionic,now 1:18.04+20180423 all [installed]
language-selector-gnome/bionic-updates,bionic-updates,now 0.188.1 all [installed,automatic]
libgnome-autoar-0-0/bionic,now 0.2.3-1 amd64 [installed,automatic]
libgnome-bluetooth13/bionic,now 3.28.0-2 amd64 [installed,automatic]
libgnome-desktop-3-17/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
libgnome-games-support-1-3/bionic,now 1.4.1-1 amd64 [installed,automatic]
libgnome-games-support-common/bionic,bionic,now 1.4.1-1 all [installed,automatic]
libgnome-keyring-common/bionic,bionic,now 3.12.0-1build1 all [installed,automatic]
libgnome-keyring0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
libgnome-menu-3-0/bionic,now 3.13.3-11ubuntu1 amd64 [installed,automatic]
libgnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
libgnomekbd-common/bionic,bionic,now 3.26.0-3 all [installed,automatic]
libgnomekbd8/bionic,now 3.26.0-3 amd64 [installed,automatic]
libnautilus-extension1a/bionic,now 1:3.26.3-0ubuntu4 amd64 [installed,automatic]
libpam-gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
libreoffice-gnome/bionic,now 1:6.0.3-0ubuntu1 amd64 [installed]
libsoup-gnome2.4-1/bionic,now 2.62.1-1 amd64 [installed,automatic]
nautilus-extension-gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed,automatic]
network-manager-gnome/bionic,now 1.8.10-2ubuntu1 amd64 [installed]
network-manager-pptp-gnome/bionic,now 1.2.6-1 amd64 [installed]
pinentry-gnome3/bionic,now 1.1.0-1 amd64 [installed,automatic]
policykit-1-gnome/bionic,now 0.105-6ubuntu2 amd64 [installed,automatic]
thunderbird-gnome-support/bionic-updates,bionic-security,now 1:52.8.0+build1-0ubuntu0.18.04.1 amd64 [installed,automatic]









share|improve this question
























  • have you installed some additional video driver ?
    – cmak.fr
    Jun 18 '18 at 18:53










  • I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
    – bigless
    Jun 18 '18 at 18:55










  • Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
    – cmak.fr
    Jun 18 '18 at 19:00








  • 1




    does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
    – cmak.fr
    Jun 18 '18 at 19:52






  • 3




    It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
    – heynnema
    Jun 19 '18 at 13:37














4












4








4


1





I am using 18.04 few months and about every 2 days, there is random GUI freeze. It already happened during web browsing, coding as well as watching movie so I guess that it is not application issue. It freezes completely including cursor. I checked syslog and kernlog without any clues (last message is usually few mins before crash). Any recommendations to find out whats wrong? Atm I would appreciate any error message..



GPU: AMD HD7970
Driver: Mesa 18.0.5
CPU: Ryzen 5



Thanks



Edit: running apt-get update aprox once per week.



Edit2: apt list --installed | grep 'gnome|extension|shell'



compiz-gnome/bionic,now 1:0.9.13.1+18.04.20180302-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomebluetooth-1.0/bionic,now 3.28.0-2 amd64 [installed,automatic]
gir1.2-gnomedesktop-3.0/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomekeyring-1.0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
gnome-accessibility-themes/bionic,bionic,now 3.28-1ubuntu1 all [installed]
gnome-bluetooth/bionic,now 3.28.0-2 amd64 [installed]
gnome-calculator/bionic,now 1:3.28.1-1ubuntu1 amd64 [installed]
gnome-calendar/bionic-proposed,now 3.28.2-0ubuntu0.18.04.1 amd64 [installed,automatic]
gnome-control-center/bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-control-center-data/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-control-center-faces/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-desktop3-data/bionic-proposed,bionic-proposed,now 3.28.2-0ubuntu1 all [installed,automatic]
gnome-disk-utility/bionic,now 3.28.1-0ubuntu1 amd64 [installed]
gnome-font-viewer/bionic,now 3.28.0-1 amd64 [installed]
gnome-getting-started-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-initial-setup/bionic-proposed,now 3.28.0-2ubuntu6.16.04.1 amd64 [installed,automatic]
gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
gnome-keyring-pkcs11/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-mahjongg/bionic,now 1:3.22.0-3 amd64 [installed,automatic]
gnome-menus/bionic,now 3.13.3-11ubuntu1 amd64 [installed]
gnome-mines/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-online-accounts/bionic-proposed,now 3.28.0-0ubuntu2.1 amd64 [installed,automatic]
gnome-orca/bionic,bionic,now 3.28.0-3ubuntu1 all [installed,automatic]
gnome-power-manager/bionic,now 3.26.0-1 amd64 [installed]
gnome-screensaver/bionic,now 3.6.1-8ubuntu3 amd64 [installed]
gnome-screenshot/bionic,now 3.25.0-0ubuntu2 amd64 [installed]
gnome-session-bin/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-session-canberra/bionic,now 0.30-5ubuntu1 amd64 [installed]
gnome-session-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu3 all [installed,automatic]
gnome-settings-daemon/bionic,now 3.28.1-0ubuntu1 amd64 [installed,automatic]
gnome-settings-daemon-schemas/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-shell/bionic,now 3.28.1-0ubuntu2 amd64 [installed,automatic]
gnome-shell-common/bionic,bionic,now 3.28.1-0ubuntu2 all [installed,automatic]
gnome-shell-extension-appindicator/bionic,bionic,now 18.04.1 all [installed,automatic]
gnome-shell-extension-ubuntu-dock/bionic,bionic,now 0.9.1 all [installed,automatic]
gnome-software/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-software-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu4.18.04.1 all [installed,automatic]
gnome-software-plugin-snap/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-startup-applications/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-sudoku/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-system-log/bionic,now 3.9.90-5 amd64 [installed]
gnome-system-monitor/bionic-updates,now 3.28.2-0ubuntu1 amd64 [installed]
gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed]
gnome-terminal-data/bionic-proposed,bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 all [installed,automatic]
gnome-themes-extra/bionic,now 3.28-1ubuntu1 amd64 [installed,automatic]
gnome-themes-extra-data/bionic,bionic,now 3.28-1ubuntu1 all [installed,automatic]
gnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
gnome-todo-common/bionic,bionic,now 3.28.1-1 all [installed,automatic]
gnome-user-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-guide/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-share/bionic,now 3.18.3-3 amd64 [installed,automatic]
gnome-video-effects/bionic,bionic,now 0.4.3-1ubuntu1 all [installed,automatic]
language-pack-gnome-cs/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-cs-base/bionic,bionic,now 1:18.04+20180423 all [installed,automatic]
language-pack-gnome-en/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-en-base/bionic,bionic,now 1:18.04+20180423 all [installed]
language-selector-gnome/bionic-updates,bionic-updates,now 0.188.1 all [installed,automatic]
libgnome-autoar-0-0/bionic,now 0.2.3-1 amd64 [installed,automatic]
libgnome-bluetooth13/bionic,now 3.28.0-2 amd64 [installed,automatic]
libgnome-desktop-3-17/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
libgnome-games-support-1-3/bionic,now 1.4.1-1 amd64 [installed,automatic]
libgnome-games-support-common/bionic,bionic,now 1.4.1-1 all [installed,automatic]
libgnome-keyring-common/bionic,bionic,now 3.12.0-1build1 all [installed,automatic]
libgnome-keyring0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
libgnome-menu-3-0/bionic,now 3.13.3-11ubuntu1 amd64 [installed,automatic]
libgnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
libgnomekbd-common/bionic,bionic,now 3.26.0-3 all [installed,automatic]
libgnomekbd8/bionic,now 3.26.0-3 amd64 [installed,automatic]
libnautilus-extension1a/bionic,now 1:3.26.3-0ubuntu4 amd64 [installed,automatic]
libpam-gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
libreoffice-gnome/bionic,now 1:6.0.3-0ubuntu1 amd64 [installed]
libsoup-gnome2.4-1/bionic,now 2.62.1-1 amd64 [installed,automatic]
nautilus-extension-gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed,automatic]
network-manager-gnome/bionic,now 1.8.10-2ubuntu1 amd64 [installed]
network-manager-pptp-gnome/bionic,now 1.2.6-1 amd64 [installed]
pinentry-gnome3/bionic,now 1.1.0-1 amd64 [installed,automatic]
policykit-1-gnome/bionic,now 0.105-6ubuntu2 amd64 [installed,automatic]
thunderbird-gnome-support/bionic-updates,bionic-security,now 1:52.8.0+build1-0ubuntu0.18.04.1 amd64 [installed,automatic]









share|improve this question















I am using 18.04 few months and about every 2 days, there is random GUI freeze. It already happened during web browsing, coding as well as watching movie so I guess that it is not application issue. It freezes completely including cursor. I checked syslog and kernlog without any clues (last message is usually few mins before crash). Any recommendations to find out whats wrong? Atm I would appreciate any error message..



GPU: AMD HD7970
Driver: Mesa 18.0.5
CPU: Ryzen 5



Thanks



Edit: running apt-get update aprox once per week.



Edit2: apt list --installed | grep 'gnome|extension|shell'



compiz-gnome/bionic,now 1:0.9.13.1+18.04.20180302-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomebluetooth-1.0/bionic,now 3.28.0-2 amd64 [installed,automatic]
gir1.2-gnomedesktop-3.0/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
gir1.2-gnomekeyring-1.0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
gnome-accessibility-themes/bionic,bionic,now 3.28-1ubuntu1 all [installed]
gnome-bluetooth/bionic,now 3.28.0-2 amd64 [installed]
gnome-calculator/bionic,now 1:3.28.1-1ubuntu1 amd64 [installed]
gnome-calendar/bionic-proposed,now 3.28.2-0ubuntu0.18.04.1 amd64 [installed,automatic]
gnome-control-center/bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-control-center-data/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-control-center-faces/bionic-updates,bionic-updates,now 1:3.28.1-0ubuntu1.18.04.1 all [installed,automatic]
gnome-desktop3-data/bionic-proposed,bionic-proposed,now 3.28.2-0ubuntu1 all [installed,automatic]
gnome-disk-utility/bionic,now 3.28.1-0ubuntu1 amd64 [installed]
gnome-font-viewer/bionic,now 3.28.0-1 amd64 [installed]
gnome-getting-started-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-initial-setup/bionic-proposed,now 3.28.0-2ubuntu6.16.04.1 amd64 [installed,automatic]
gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
gnome-keyring-pkcs11/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed,automatic]
gnome-mahjongg/bionic,now 1:3.22.0-3 amd64 [installed,automatic]
gnome-menus/bionic,now 3.13.3-11ubuntu1 amd64 [installed]
gnome-mines/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-online-accounts/bionic-proposed,now 3.28.0-0ubuntu2.1 amd64 [installed,automatic]
gnome-orca/bionic,bionic,now 3.28.0-3ubuntu1 all [installed,automatic]
gnome-power-manager/bionic,now 3.26.0-1 amd64 [installed]
gnome-screensaver/bionic,now 3.6.1-8ubuntu3 amd64 [installed]
gnome-screenshot/bionic,now 3.25.0-0ubuntu2 amd64 [installed]
gnome-session-bin/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-session-canberra/bionic,now 0.30-5ubuntu1 amd64 [installed]
gnome-session-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu3 all [installed,automatic]
gnome-settings-daemon/bionic,now 3.28.1-0ubuntu1 amd64 [installed,automatic]
gnome-settings-daemon-schemas/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-shell/bionic,now 3.28.1-0ubuntu2 amd64 [installed,automatic]
gnome-shell-common/bionic,bionic,now 3.28.1-0ubuntu2 all [installed,automatic]
gnome-shell-extension-appindicator/bionic,bionic,now 18.04.1 all [installed,automatic]
gnome-shell-extension-ubuntu-dock/bionic,bionic,now 0.9.1 all [installed,automatic]
gnome-software/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-software-common/bionic-updates,bionic-updates,now 3.28.1-0ubuntu4.18.04.1 all [installed,automatic]
gnome-software-plugin-snap/bionic-updates,now 3.28.1-0ubuntu4.18.04.1 amd64 [installed,automatic]
gnome-startup-applications/bionic-updates,now 3.28.1-0ubuntu3 amd64 [installed,automatic]
gnome-sudoku/bionic,now 1:3.28.0-1 amd64 [installed,automatic]
gnome-system-log/bionic,now 3.9.90-5 amd64 [installed]
gnome-system-monitor/bionic-updates,now 3.28.2-0ubuntu1 amd64 [installed]
gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed]
gnome-terminal-data/bionic-proposed,bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 all [installed,automatic]
gnome-themes-extra/bionic,now 3.28-1ubuntu1 amd64 [installed,automatic]
gnome-themes-extra-data/bionic,bionic,now 3.28-1ubuntu1 all [installed,automatic]
gnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
gnome-todo-common/bionic,bionic,now 3.28.1-1 all [installed,automatic]
gnome-user-docs/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-guide/bionic,bionic,now 3.28.1-0ubuntu1 all [installed,automatic]
gnome-user-share/bionic,now 3.18.3-3 amd64 [installed,automatic]
gnome-video-effects/bionic,bionic,now 0.4.3-1ubuntu1 all [installed,automatic]
language-pack-gnome-cs/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-cs-base/bionic,bionic,now 1:18.04+20180423 all [installed,automatic]
language-pack-gnome-en/bionic,bionic,now 1:18.04+20180423 all [installed]
language-pack-gnome-en-base/bionic,bionic,now 1:18.04+20180423 all [installed]
language-selector-gnome/bionic-updates,bionic-updates,now 0.188.1 all [installed,automatic]
libgnome-autoar-0-0/bionic,now 0.2.3-1 amd64 [installed,automatic]
libgnome-bluetooth13/bionic,now 3.28.0-2 amd64 [installed,automatic]
libgnome-desktop-3-17/bionic-proposed,now 3.28.2-0ubuntu1 amd64 [installed,automatic]
libgnome-games-support-1-3/bionic,now 1.4.1-1 amd64 [installed,automatic]
libgnome-games-support-common/bionic,bionic,now 1.4.1-1 all [installed,automatic]
libgnome-keyring-common/bionic,bionic,now 3.12.0-1build1 all [installed,automatic]
libgnome-keyring0/bionic,now 3.12.0-1build1 amd64 [installed,automatic]
libgnome-menu-3-0/bionic,now 3.13.3-11ubuntu1 amd64 [installed,automatic]
libgnome-todo/bionic,now 3.28.1-1 amd64 [installed,automatic]
libgnomekbd-common/bionic,bionic,now 3.26.0-3 all [installed,automatic]
libgnomekbd8/bionic,now 3.26.0-3 amd64 [installed,automatic]
libnautilus-extension1a/bionic,now 1:3.26.3-0ubuntu4 amd64 [installed,automatic]
libpam-gnome-keyring/bionic-updates,now 3.28.0.2-1ubuntu1.18.04.1 amd64 [installed]
libreoffice-gnome/bionic,now 1:6.0.3-0ubuntu1 amd64 [installed]
libsoup-gnome2.4-1/bionic,now 2.62.1-1 amd64 [installed,automatic]
nautilus-extension-gnome-terminal/bionic-proposed,now 3.28.2-1ubuntu1~18.04.1 amd64 [installed,automatic]
network-manager-gnome/bionic,now 1.8.10-2ubuntu1 amd64 [installed]
network-manager-pptp-gnome/bionic,now 1.2.6-1 amd64 [installed]
pinentry-gnome3/bionic,now 1.1.0-1 amd64 [installed,automatic]
policykit-1-gnome/bionic,now 0.105-6ubuntu2 amd64 [installed,automatic]
thunderbird-gnome-support/bionic-updates,bionic-security,now 1:52.8.0+build1-0ubuntu0.18.04.1 amd64 [installed,automatic]






drivers gnome freeze amd-graphics






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Jun 19 '18 at 0:41

























asked Jun 18 '18 at 18:48









bigless

12316




12316












  • have you installed some additional video driver ?
    – cmak.fr
    Jun 18 '18 at 18:53










  • I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
    – bigless
    Jun 18 '18 at 18:55










  • Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
    – cmak.fr
    Jun 18 '18 at 19:00








  • 1




    does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
    – cmak.fr
    Jun 18 '18 at 19:52






  • 3




    It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
    – heynnema
    Jun 19 '18 at 13:37


















  • have you installed some additional video driver ?
    – cmak.fr
    Jun 18 '18 at 18:53










  • I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
    – bigless
    Jun 18 '18 at 18:55










  • Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
    – cmak.fr
    Jun 18 '18 at 19:00








  • 1




    does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
    – cmak.fr
    Jun 18 '18 at 19:52






  • 3




    It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
    – heynnema
    Jun 19 '18 at 13:37
















have you installed some additional video driver ?
– cmak.fr
Jun 18 '18 at 18:53




have you installed some additional video driver ?
– cmak.fr
Jun 18 '18 at 18:53












I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
– bigless
Jun 18 '18 at 18:55




I mentioned also video driver. I did not touch anything related to GPU (like video driver) since upgrade from 16.04
– bigless
Jun 18 '18 at 18:55












Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
– cmak.fr
Jun 18 '18 at 19:00






Launch software-properties-gtk, open the Additionnal Drivers tab and see if some video driver can be found.
– cmak.fr
Jun 18 '18 at 19:00






1




1




does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
– cmak.fr
Jun 18 '18 at 19:52




does it freeze with a LiveUSB 18.04? No? So id probably go for a clean install... (I always have clean installs from scratch, i hate versions hops)
– cmak.fr
Jun 18 '18 at 19:52




3




3




It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
– heynnema
Jun 19 '18 at 13:37




It looks like you've enabled bionic-proposed, and that may have installed software that's causing your problem. Disable bionic-proposed and downgrade that software to the standard 18.04.1 versions.
– heynnema
Jun 19 '18 at 13:37










1 Answer
1






active

oldest

votes


















2














From the comments...




  • we downgraded from bionic-proposed to main

  • we restarted the GNOME Shell with ALT+F2, then r

  • the computer should be rebooted at this time


So far the computer has been running fine!






share|improve this answer

















  • 1




    Just happend again :( Now I can also say that alt+f2 does not work.
    – bigless
    Jul 11 '18 at 16:21










  • What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
    – heynnema
    Jul 11 '18 at 18:09










  • Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
    – bigless
    Jul 11 '18 at 18:29








  • 1




    Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
    – heynnema
    Jul 11 '18 at 19:14








  • 1




    @user238607 please start a new question, and we'll see if we can get you some help.
    – heynnema
    Oct 12 '18 at 14:00










protected by Community Dec 5 '18 at 16:05



Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).



Would you like to answer one of these unanswered questions instead?














1 Answer
1






active

oldest

votes








1 Answer
1






active

oldest

votes









active

oldest

votes






active

oldest

votes









2














From the comments...




  • we downgraded from bionic-proposed to main

  • we restarted the GNOME Shell with ALT+F2, then r

  • the computer should be rebooted at this time


So far the computer has been running fine!






share|improve this answer

















  • 1




    Just happend again :( Now I can also say that alt+f2 does not work.
    – bigless
    Jul 11 '18 at 16:21










  • What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
    – heynnema
    Jul 11 '18 at 18:09










  • Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
    – bigless
    Jul 11 '18 at 18:29








  • 1




    Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
    – heynnema
    Jul 11 '18 at 19:14








  • 1




    @user238607 please start a new question, and we'll see if we can get you some help.
    – heynnema
    Oct 12 '18 at 14:00
















2














From the comments...




  • we downgraded from bionic-proposed to main

  • we restarted the GNOME Shell with ALT+F2, then r

  • the computer should be rebooted at this time


So far the computer has been running fine!






share|improve this answer

















  • 1




    Just happend again :( Now I can also say that alt+f2 does not work.
    – bigless
    Jul 11 '18 at 16:21










  • What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
    – heynnema
    Jul 11 '18 at 18:09










  • Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
    – bigless
    Jul 11 '18 at 18:29








  • 1




    Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
    – heynnema
    Jul 11 '18 at 19:14








  • 1




    @user238607 please start a new question, and we'll see if we can get you some help.
    – heynnema
    Oct 12 '18 at 14:00














2












2








2






From the comments...




  • we downgraded from bionic-proposed to main

  • we restarted the GNOME Shell with ALT+F2, then r

  • the computer should be rebooted at this time


So far the computer has been running fine!






share|improve this answer












From the comments...




  • we downgraded from bionic-proposed to main

  • we restarted the GNOME Shell with ALT+F2, then r

  • the computer should be rebooted at this time


So far the computer has been running fine!







share|improve this answer












share|improve this answer



share|improve this answer










answered Jun 23 '18 at 1:28









heynnema

18.2k22054




18.2k22054








  • 1




    Just happend again :( Now I can also say that alt+f2 does not work.
    – bigless
    Jul 11 '18 at 16:21










  • What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
    – heynnema
    Jul 11 '18 at 18:09










  • Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
    – bigless
    Jul 11 '18 at 18:29








  • 1




    Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
    – heynnema
    Jul 11 '18 at 19:14








  • 1




    @user238607 please start a new question, and we'll see if we can get you some help.
    – heynnema
    Oct 12 '18 at 14:00














  • 1




    Just happend again :( Now I can also say that alt+f2 does not work.
    – bigless
    Jul 11 '18 at 16:21










  • What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
    – heynnema
    Jul 11 '18 at 18:09










  • Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
    – bigless
    Jul 11 '18 at 18:29








  • 1




    Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
    – heynnema
    Jul 11 '18 at 19:14








  • 1




    @user238607 please start a new question, and we'll see if we can get you some help.
    – heynnema
    Oct 12 '18 at 14:00








1




1




Just happend again :( Now I can also say that alt+f2 does not work.
– bigless
Jul 11 '18 at 16:21




Just happend again :( Now I can also say that alt+f2 does not work.
– bigless
Jul 11 '18 at 16:21












What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
– heynnema
Jul 11 '18 at 18:09




What kernel version are you running? Would it be 4.15.0-24-generic by chance? uname -r to find out. Any new GNOME extensions beside dock and appindicators?
– heynnema
Jul 11 '18 at 18:09












Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
– bigless
Jul 11 '18 at 18:29






Yep, 4.15.0-24-generic. I have not installed any new extensions. Nothing changed since I asked this question except apt-get upgrade. Syslog at given time: Jul 11 18:05:22 xxx-desktop anacron[11926]: Normal exit (0 jobs run), empty line and then Jul 11 18:20:44 xxx-desktop systemd[1]: Starting Flush Journal to Persistent Storage...
– bigless
Jul 11 '18 at 18:29






1




1




Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
– heynnema
Jul 11 '18 at 19:14






Good guess, huh? -24 has some known problems. Try booting to a prior kernel, like -23, if you still have it installed, and run that way for a while and see if you continue to have problems. Report back. Does dkms status show anything?
– heynnema
Jul 11 '18 at 19:14






1




1




@user238607 please start a new question, and we'll see if we can get you some help.
– heynnema
Oct 12 '18 at 14:00




@user238607 please start a new question, and we'll see if we can get you some help.
– heynnema
Oct 12 '18 at 14:00





protected by Community Dec 5 '18 at 16:05



Thank you for your interest in this question.
Because it has attracted low-quality or spam answers that had to be removed, posting an answer now requires 10 reputation on this site (the association bonus does not count).



Would you like to answer one of these unanswered questions instead?



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