[Bug 1816530] Re: DNS servers are not being set in the system correctly when you upgrade from 16.04 to 18.04

[Zoltán Süle]

$ ls -l /etc/resolv.conf

lrwxrwxrwx 1 root root 29 Aug  4  2016 /etc/resolv.conf ->
../run/resolvconf/resolv.conf


$ cat /etc/resolv.conf

# 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
search home
options edns0


$ systemd-resolve --status

Global
         DNS Servers: 8.8.8.8
          DNSSEC NTA: 10.in-addr.arpa
                      16.172.in-addr.arpa
                      168.192.in-addr.arpa
                      17.172.in-addr.arpa
                      18.172.in-addr.arpa
                      19.172.in-addr.arpa
                      20.172.in-addr.arpa
                      21.172.in-addr.arpa
                      22.172.in-addr.arpa
                      23.172.in-addr.arpa
                      24.172.in-addr.arpa
                      25.172.in-addr.arpa
                      26.172.in-addr.arpa
                      27.172.in-addr.arpa
                      28.172.in-addr.arpa
                      29.172.in-addr.arpa
                      30.172.in-addr.arpa
                      31.172.in-addr.arpa
                      corp
                      d.f.ip6.arpa
                      home
                      internal
                      intranet
                      lan
                      local
                      private
                      test

Link 5 (virbr0-nic)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 4 (virbr0)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
Link 3 (wlp2s0)
      Current Scopes: none
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no

Link 2 (eno1)
      Current Scopes: DNS
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 195.34.133.21
                      212.186.211.21
          DNS Domain: home


$ grep . /run/resolvconf/interface/*

nameserver 127.0.0.53
options edns0
search home

-- 
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https://bugs.launchpad.net/bugs/1816530

Title:
  DNS servers are not being set in the system correctly when you upgrade
  from 16.04 to 18.04

Status in resolvconf package in Ubuntu:
  New

Bug description:
  I upgraded my 16.04 to 18.04 before the official release. After the
  upgrade I noticed that I don't have internet access. The wired network
  and the wifi settings looked good, but the internet didn't work. After
  the login the system always switched itself into airplane mode. I
  tethered the network via USB and Bluetooth by my mobile but they also
  didn't work.

  I found a useful answer from @andrew-woodhead666:
  https://answers.launchpad.net/ubuntu/+question/665374

  it seems this bug is still not fixed for the upgraded dists in the main release and affects a few dozens of ubuntu users.
  https://askubuntu.com/questions/1021884/no-internet-after-upgrade-from-16-04-to-18-04

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