Cfrgtkky

I upgraded to Ubuntu 18.04 and suddenly I don't have internet on command line, wired nor wireless, some domains seem not to resolve, though ping 8.8.8.8 does work, but service networking status is outputting error. I saw many tweaks here on askubuntu regarding the issue, with ifconfig or /etc/network/interface but none fully works. sudo service network-manager restart does not work either.

My network is basically a mess. Is there a way to fully reset network settings to a functional one? How is it possible that Ubuntu is releasing a main distro with such a bug, since this is a hot topic around?

Edit:

output of ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        ether 00:8c:fa:8a:7c:ba  txqueuelen 1000  (Ethernet)

        RX packets 12829  bytes 5924414 (5.9 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 8755  bytes 1396496 (1.3 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536

        inet 127.0.0.1  netmask 255.0.0.0

        inet6 ::1  prefixlen 128  scopeid 0x10<host>

        loop  txqueuelen 1000  (Local Loopback)

        RX packets 40521  bytes 4309970 (4.3 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 40521  bytes 4309970 (4.3 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0



wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500

        inet 192.168.1.3  netmask 255.255.255.0  broadcast 192.168.1.255

        inet6 fe80::5e82:7f12:37f8:854f  prefixlen 64  scopeid 0x20<link>

        ether 34:de:1a:7f:93:1a  txqueuelen 1000  (Ethernet)

        RX packets 27441  bytes 22237443 (22.2 MB)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 18332  bytes 5607005 (5.6 MB)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

output of ip addr && cat /etc/resolv.conf && sudo lshw -C Network

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000

    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00

    inet 127.0.0.1/8 scope host lo

       valid_lft forever preferred_lft forever

    inet6 ::1/128 scope host 

       valid_lft forever preferred_lft forever

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000

    link/ether 00:8c:fa:8a:7c:ba brd ff:ff:ff:ff:ff:ff

3: wlan0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000

    link/ether 34:de:1a:7f:93:1a brd ff:ff:ff:ff:ff:ff

    inet 192.168.1.3/24 brd 192.168.1.255 scope global dynamic noprefixroute wlan0

       valid_lft 84519sec preferred_lft 84519sec

    inet6 fe80::5e82:7f12:37f8:854f/64 scope link noprefixroute 

       valid_lft forever preferred_lft forever

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)

#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN

# 127.0.0.53 is the systemd-resolved stub resolver.

# run "systemd-resolve --status" to see details about the actual nameservers.



nameserver 8.8.8.8

nameserver 127.0.0.53

options edns0

  *-network                 

       description: Ethernet interface

       product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:07:00.0

       logical name: eth0

       version: 0c

       serial: 00:8c:fa:8a:7c:ba

       size: 1Gbit/s

       capacity: 1Gbit/s

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation

       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168g-2_0.0.1 02/06/13 latency=0 link=yes multicast=yes port=MII speed=1Gbit/s

       resources: irq:16 ioport:3000(size=256) memory:c1700000-c1700fff memory:c1400000-c1403fff

  *-network

       description: Wireless interface

       product: Wireless 3160

       vendor: Intel Corporation

       physical id: 0

       bus info: pci@0000:08:00.0

       logical name: wlan0

       version: cb

       serial: 34:de:1a:7f:93:1a

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless

       configuration: broadcast=yes driver=iwlwifi driverversion=4.15.0-45-generic firmware=17.948900127.0 ip=192.168.1.3 latency=0 link=yes multicast=yes wireless=IEEE 802.11

       resources: irq:33 memory:c1600000-c1601fff

cat /etc/apt/sources.list:

# deb cdrom:[Ubuntu 15.10 _Wily Werewolf_ - Release amd64 (20151021)]/ wily main restricted



# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to

# newer versions of the distribution.



## Major bug fix updates produced after the final release of the

## distribution.



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu

## team. Also, please note that software in universe WILL NOT receive any

## review or updates from the Ubuntu security team.



## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu 

## team, and may not be under a free licence. Please satisfy yourself as to 

## your rights to use the software. Also, please note that software in 

## multiverse WILL NOT receive any review or updates from the Ubuntu

## security team.



## N.B. software from this repository may not have been tested as

## extensively as that contained in the main release, although it includes

## newer versions of some applications which may provide useful features.

## Also, please note that software in backports WILL NOT receive any review

## or updates from the Ubuntu security team.





## Uncomment the following two lines to add software from Canonical's

## 'partner' repository.

## This software is not part of Ubuntu, but is offered by Canonical and the

deb http://archive.ubuntu.com/ubuntu bionic main universe restricted multiverse

## respective vendors as a service to Ubuntu users.

deb http://security.ubuntu.com/ubuntu/ bionic-security universe multiverse restricted main

deb http://archive.ubuntu.com/ubuntu bionic-updates universe multiverse restricted main

deb http://archive.ubuntu.com/ubuntu bionic-backports universe multiverse restricted main

deb http://archive.canonical.com/ubuntu bionic partner

# deb-src http://archive.canonical.com/ubuntu bionic partner

deb [arch=amd64,i386] https://deb.opera.com/opera-stable/ stable non-free

# deb-src [arch=amd64,i386] https://deb.opera.com/opera-stable/ stable non-free

Ubuntu 18.04 no longer uses ifupdown(/etc/network/interfaces). That is where you are going wrong

They switched to netplan, huge pain. See more info here

I happen to solve this issue by factory resetting the definitions of the router.