Sudo hangs without prompting for password
I just did a fresh install of Ubuntu and now when I try to use sudo in the terminal emulator, it just hangs there without even asking me for a password.
If I switch to the terminal (Ctrl + Alt + F1) and login, sudo works as expected.
Can someone help me to figure this out?
sudo
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
add a comment |
I just did a fresh install of Ubuntu and now when I try to use sudo in the terminal emulator, it just hangs there without even asking me for a password.
If I switch to the terminal (Ctrl + Alt + F1) and login, sudo works as expected.
Can someone help me to figure this out?
sudo
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31
add a comment |
I just did a fresh install of Ubuntu and now when I try to use sudo in the terminal emulator, it just hangs there without even asking me for a password.
If I switch to the terminal (Ctrl + Alt + F1) and login, sudo works as expected.
Can someone help me to figure this out?
sudo
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
I just did a fresh install of Ubuntu and now when I try to use sudo in the terminal emulator, it just hangs there without even asking me for a password.
If I switch to the terminal (Ctrl + Alt + F1) and login, sudo works as expected.
Can someone help me to figure this out?
sudo
sudo
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
asked Jul 29 '13 at 19:19
LawrenceLawrence
76113
76113
Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31
add a comment |
Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31
Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31
add a comment |
4 Answers
4
active
oldest
votes
Have you changed the hostname recently? I've noticed after a hostname change sudo can hang for a bit. However, if you update your hosts file to reflect the hostname change the hang will go away.
You can do that with this simple one-liner:
hostname | (echo -n "127.0.0.1 " && cat) | sudo tee -a /etc/hosts
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
Give this man a cookie! Thanks when changing theDevice Namein Ubuntu's system details utility you effectively break sudo. Great work @Canonical.
– Flatron
Feb 1 '17 at 7:32
1
to fix it make sure to change/etc/hostsalso to your new hostname ;)
– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
add a comment |
If you want to check where it hangs, I suggest doing the executing the following command:
strace sudo
and then see what system call it is possibly hanging on. This might provide a good clue as to what is happening on your system.
My guess based on what you see is that hostname resolution is problematic on your system. Check out /etc/nsswitch.conf and /etc/resolv.conf files to make sure they are configured properly.
I have assummed that you have already checked your internet connectivity.
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
add a comment |
I am not sure which version of ubuntu you have installed, but there is a bug (race condition) in sudo, which hangs indefinitely blocking on a select.
https://bugzilla.sudo.ws/show_bug.cgi?id=447
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
add a comment |
I too had this problem with Ubuntu 16.04 . Using "top" command i found that two processes "vnstat" and "NetworkManager" are consuming 100% CPU. So i restarted the system, went to recovery mode and removed the package "vnstat" . After this restarted the system , now system works fine.
answered Jan 5 at 1:39
manishmanish
133
add a comment |
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4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
Have you changed the hostname recently? I've noticed after a hostname change sudo can hang for a bit. However, if you update your hosts file to reflect the hostname change the hang will go away.
You can do that with this simple one-liner:
hostname | (echo -n "127.0.0.1 " && cat) | sudo tee -a /etc/hosts
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
Give this man a cookie! Thanks when changing theDevice Namein Ubuntu's system details utility you effectively break sudo. Great work @Canonical.
– Flatron
Feb 1 '17 at 7:32
1
to fix it make sure to change/etc/hostsalso to your new hostname ;)
– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
add a comment |
Have you changed the hostname recently? I've noticed after a hostname change sudo can hang for a bit. However, if you update your hosts file to reflect the hostname change the hang will go away.
You can do that with this simple one-liner:
hostname | (echo -n "127.0.0.1 " && cat) | sudo tee -a /etc/hosts
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
Give this man a cookie! Thanks when changing theDevice Namein Ubuntu's system details utility you effectively break sudo. Great work @Canonical.
– Flatron
Feb 1 '17 at 7:32
1
to fix it make sure to change/etc/hostsalso to your new hostname ;)
– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
add a comment |
Have you changed the hostname recently? I've noticed after a hostname change sudo can hang for a bit. However, if you update your hosts file to reflect the hostname change the hang will go away.
You can do that with this simple one-liner:
hostname | (echo -n "127.0.0.1 " && cat) | sudo tee -a /etc/hosts
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
Have you changed the hostname recently? I've noticed after a hostname change sudo can hang for a bit. However, if you update your hosts file to reflect the hostname change the hang will go away.
You can do that with this simple one-liner:
hostname | (echo -n "127.0.0.1 " && cat) | sudo tee -a /etc/hosts
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
edited Jul 6 '18 at 20:07
K7AAY
3,89921644
3,89921644
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
answered Jul 29 '13 at 19:24
swiftimundoswiftimundo
18314
18314
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
Give this man a cookie! Thanks when changing theDevice Namein Ubuntu's system details utility you effectively break sudo. Great work @Canonical.
– Flatron
Feb 1 '17 at 7:32
1
to fix it make sure to change/etc/hostsalso to your new hostname ;)
– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
add a comment |
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
Give this man a cookie! Thanks when changing theDevice Namein Ubuntu's system details utility you effectively break sudo. Great work @Canonical.
– Flatron
Feb 1 '17 at 7:32
1
to fix it make sure to change/etc/hostsalso to your new hostname ;)
– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
1
1
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
It does not hang for 'a bit', it just hangs indefinitely. Also, it works on the terminal, just not in the terminal emulator.
– Lawrence
Jul 29 '13 at 19:54
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
This was the exact problem! Thank you!
– Nemanja Boric
Mar 24 '15 at 16:52
1
1
Give this man a cookie! Thanks when changing the
Device Name in Ubuntu's system details utility you effectively break sudo. Great work @Canonical.– Flatron
Feb 1 '17 at 7:32
Give this man a cookie! Thanks when changing the
Device Name in Ubuntu's system details utility you effectively break sudo. Great work @Canonical.– Flatron
Feb 1 '17 at 7:32
1
1
to fix it make sure to change
/etc/hosts also to your new hostname ;)– Flatron
Feb 1 '17 at 7:32
to fix it make sure to change
/etc/hosts also to your new hostname ;)– Flatron
Feb 1 '17 at 7:32
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
Great! I didn't actually notice that it timed out after ~30 sec and then continue with asking for sudo password. Another point: when you is about to change your hostname (maybe you cloned a VM) you might be disconnected to any network to avoid conflicts until you have change the entries. That's is properly also what's causing the timeouts
– Hulvej
Apr 23 '18 at 8:18
add a comment |
If you want to check where it hangs, I suggest doing the executing the following command:
strace sudo
and then see what system call it is possibly hanging on. This might provide a good clue as to what is happening on your system.
My guess based on what you see is that hostname resolution is problematic on your system. Check out /etc/nsswitch.conf and /etc/resolv.conf files to make sure they are configured properly.
I have assummed that you have already checked your internet connectivity.
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
add a comment |
If you want to check where it hangs, I suggest doing the executing the following command:
strace sudo
and then see what system call it is possibly hanging on. This might provide a good clue as to what is happening on your system.
My guess based on what you see is that hostname resolution is problematic on your system. Check out /etc/nsswitch.conf and /etc/resolv.conf files to make sure they are configured properly.
I have assummed that you have already checked your internet connectivity.
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
add a comment |
If you want to check where it hangs, I suggest doing the executing the following command:
strace sudo
and then see what system call it is possibly hanging on. This might provide a good clue as to what is happening on your system.
My guess based on what you see is that hostname resolution is problematic on your system. Check out /etc/nsswitch.conf and /etc/resolv.conf files to make sure they are configured properly.
I have assummed that you have already checked your internet connectivity.
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
If you want to check where it hangs, I suggest doing the executing the following command:
strace sudo
and then see what system call it is possibly hanging on. This might provide a good clue as to what is happening on your system.
My guess based on what you see is that hostname resolution is problematic on your system. Check out /etc/nsswitch.conf and /etc/resolv.conf files to make sure they are configured properly.
I have assummed that you have already checked your internet connectivity.
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
answered Jul 29 '13 at 21:05
mdpcmdpc
8361818
8361818
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
add a comment |
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
1
1
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
Why is internet connectivity required for sudo?
– grofte
Jun 17 '17 at 7:05
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
for FQDN information...as you can put host restrictions in your sudoers file.
– mdpc
Jun 20 '17 at 18:04
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
I did not understand that. I only know that it makes it tricky to reset the wifi adapter. Which is sometimes necessary after putting the laptop in sleep.
– grofte
Jun 25 '17 at 6:20
add a comment |
I am not sure which version of ubuntu you have installed, but there is a bug (race condition) in sudo, which hangs indefinitely blocking on a select.
https://bugzilla.sudo.ws/show_bug.cgi?id=447
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
add a comment |
I am not sure which version of ubuntu you have installed, but there is a bug (race condition) in sudo, which hangs indefinitely blocking on a select.
https://bugzilla.sudo.ws/show_bug.cgi?id=447
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
add a comment |
I am not sure which version of ubuntu you have installed, but there is a bug (race condition) in sudo, which hangs indefinitely blocking on a select.
https://bugzilla.sudo.ws/show_bug.cgi?id=447
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
I am not sure which version of ubuntu you have installed, but there is a bug (race condition) in sudo, which hangs indefinitely blocking on a select.
https://bugzilla.sudo.ws/show_bug.cgi?id=447
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
answered Nov 20 '16 at 20:24
sujan bolisettisujan bolisetti
111
111
add a comment |
add a comment |
I too had this problem with Ubuntu 16.04 . Using "top" command i found that two processes "vnstat" and "NetworkManager" are consuming 100% CPU. So i restarted the system, went to recovery mode and removed the package "vnstat" . After this restarted the system , now system works fine.
answered Jan 5 at 1:39
manishmanish
133
add a comment |
I too had this problem with Ubuntu 16.04 . Using "top" command i found that two processes "vnstat" and "NetworkManager" are consuming 100% CPU. So i restarted the system, went to recovery mode and removed the package "vnstat" . After this restarted the system , now system works fine.
answered Jan 5 at 1:39
manishmanish
133
add a comment |
I too had this problem with Ubuntu 16.04 . Using "top" command i found that two processes "vnstat" and "NetworkManager" are consuming 100% CPU. So i restarted the system, went to recovery mode and removed the package "vnstat" . After this restarted the system , now system works fine.
answered Jan 5 at 1:39
manishmanish
133
I too had this problem with Ubuntu 16.04 . Using "top" command i found that two processes "vnstat" and "NetworkManager" are consuming 100% CPU. So i restarted the system, went to recovery mode and removed the package "vnstat" . After this restarted the system , now system works fine.
answered Jan 5 at 1:39
manishmanish
133
answered Jan 5 at 1:39
manishmanish
133
answered Jan 5 at 1:39
manishmanish
133
answered Jan 5 at 1:39
manishmanish
133
133
add a comment |
add a comment |
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Just a thought, have you changed the character encoding of your terminal (Open Terminal, menu Terminal -> Set Character Encoding)
– hytromo
Jul 29 '13 at 19:21
No, I haven't, but I am curious as to why that would change anything.
– Lawrence
Jul 29 '13 at 19:53
It can be the source of many problems if you change something like this, actually. But this was just a guess.
– hytromo
Jul 29 '13 at 20:18
I had the same problem. Changing from kernel 4.9 to 4.4 solved it for me.
– Tom Hale
Jan 3 '17 at 21:31