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

[Moshe Caspi]

Got the same issue after the upgrade. In my case:

moshe at moshe-desktop:~/New$ grep . /run/resolvconf/interface/*
nameserver 127.0.0.53

moshe at moshe-desktop:~/New$ 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 127.0.0.53

The difference from Zoltn's issue is that I don't have the lines:

options edns0
search home

During the upgrade which was done using Wi-Fi, the connection went down
but it was after the download completed so the upgrade ended.

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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:
  Invalid

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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