[Bug 2055012] Re: When I upgraded from 22.04 to 24.04, DNS resolution went wrong.

[WBTMagnum]

*** This bug is a duplicate of bug 2054761 ***
    https://bugs.launchpad.net/bugs/2054761

I tried to upgrade from Ubuntu 22.04.04 LTS to 24.04.1 (GUI).
Unexpectedly the upgrade was cancelled on the last 20 packages to be
downloaded (download failed). Turned out, DNS resolution failed
completely and was not recoverable.

After a reboot into 22.04, DNS resolution worked as expected again. A
few unsuccessful upgrade attempts later (same problem), I gave up and
reverted everything to the previous state. Staying with Ubuntu 22.04 LTS
for the moment.

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https://bugs.launchpad.net/bugs/2055012

Title:
  When I upgraded from 22.04 to 24.04, DNS resolution went wrong.

Status in network-manager package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Confirmed
Status in ubuntu-release-upgrader package in Ubuntu:
  Confirmed

Bug description:
  I was an unpatient idiot, and I upgraded from 22.04 to 24.04. Near to
  the end of the upgrade, I got an „Oh, no! Something has gone wrong and
  the system cannot recover. Call the system administrator” message
  after a red FAILED in the terminal. The system administrator is
  myself, because my computer is a personal one. Hard reset, same error,
  Ctrl+Alt+F3, sudo apt reinstall gdm3. Obviously. I needed to finish
  the update with dpkg. While dpkg was upgrading, it printed an error
  message for every WiFi connection:

  „[Failed] Failed to migrate [I do not remember, something with
  /etc/netplan]”

  It took at least one and a half hour to find the solution on Ask
  Ubuntu. The problem was: /etc/resolv.conf became a broken link, along
  with systemd-resolve.service. I needed to remove both of them and
  write a new resolv.conf to fix the error.

  ProblemType: Bug
  DistroRelease: Ubuntu 24.04
  Package: network-manager 1.45.90-1ubuntu1
  ProcVersionSignature: Ubuntu 6.6.0-14.14-generic 6.6.3
  Uname: Linux 6.6.0-14-generic x86_64
  ApportVersion: 2.28.0-0ubuntu1
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Feb 26 08:21:02 2024
  InstallationDate: Installed on 2023-07-05 (236 days ago)
  InstallationMedia: Ubuntu 20.04.6 LTS "Focal Fossa" - Release amd64 (20230316)
  IpRoute:
   default via 192.168.0.1 dev wlp3s0 proto dhcp src 192.168.0.100 metric 600
   192.168.0.0/24 dev wlp3s0 proto kernel scope link src 192.168.0.100 metric 600
   192.168.122.0/24 dev virbr0 proto kernel scope link src 192.168.122.1 linkdown
  ProcEnviron:
   LANG=en_US.UTF-8
   PATH=(custom, no user)
   SHELL=/bin/bash
   TERM=xterm-256color
   XDG_RUNTIME_DIR=<set>
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to noble on 2024-02-24 (2 days ago)
  modified.conffile..etc.init.d.apport: [modified]
  mtime.conffile..etc.init.d.apport: 2024-02-22T15:20:00
  nmcli-nm:
   RUNNING  VERSION  STATE      STARTUP  CONNECTIVITY  NETWORKING  WIFI-HW  WIFI     WWAN-HW  WWAN
   running  1.45.90  connected  started  full          enabled     enabled  enabled  missing  enabled

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