Comment 39 for bug 2043820

I have verified the fix using ubuntu-release-upgrader from noble-proposed using a xubuntu 22.04 VM:

ubuntu@xubuntu:~$ sudo sed -i 's/Prompt=lts/Prompt=normal/g' /etc/update-manager/release-upgrades
[sudo] password for ubuntu:
ubuntu@xubuntu:~$ do-release-upgrade --proposed
Checking for a new Ubuntu release

= Welcome to Ubuntu 24.04 LTS 'Noble Numbat' =

The Ubuntu team is proud to announce Ubuntu 24.04 LTS 'Noble Numbat'.

To see what's new in this release, visit:
  https://wiki.ubuntu.com/NobleNumbat/ReleaseNotes

[ ...SNIP... ]

In another terminal, while the upgrade was running:

ubuntu@xubuntu:~$ cat /etc/resolv.conf
# This is /run/systemd/resolve/resolv.conf managed by man:systemd-resolved(8).
# Do not edit.
#
# This file might be symlinked as /etc/resolv.conf. If you're looking at
# /etc/resolv.conf and seeing this text, you have followed the symlink.
#
# This is a dynamic resolv.conf file for connecting local clients directly to
# all known uplink DNS servers. This file lists all configured search domains.
#
# Third party programs should typically not access this file directly, but only
# through the symlink at /etc/resolv.conf. To manage man:resolv.conf(5) in a
# different way, replace this symlink by a static file or a different symlink.
#
# See man:systemd-resolved.service(8) for details about the supported modes of
# operation for /etc/resolv.conf.

nameserver 10.19.111.1
nameserver fd42:3cda:638d:a9b3::1
nameserver fe80::216:3eff:fe07:85b6%2
search lxd
ubuntu@xubuntu:~$ cat /run/systemd/resolved.conf.d/dist-upgrade-no-stub-resolver.conf
# Temporarily disable stub resolver during upgrade
[Resolve]
DNSStubListener=no
ubuntu@xubuntu:~$ tail /var/log/dist-upgrade/main.log
2024-08-12 16:21:57,233 DEBUG dir '/tmp' needs '0.0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x731e8275c940>' (14185896140.600000)
2024-08-12 16:21:57,233 DEBUG dir '/usr' needs '0.0' of '<DistUpgrade.DistUpgradeCache.MyCache.checkFreeSpace.<locals>.FreeSpace object at 0x731e8275c940>' (14185896140.600000)
2024-08-12 16:21:57,233 DEBUG Found writable ESP /dev/sda1 /boot/efi vfat rw,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=iso8859-1,shortname=mixed,errors=remount-ro 0 0
2024-08-12 16:21:57,242 DEBUG quirks: running StartUpgrade
2024-08-12 16:21:57,242 DEBUG running Quirks.StartUpgrade
2024-08-12 16:21:57,243 DEBUG skipping 'README' (no '.')
2024-08-12 16:21:57,244 DEBUG killing update-notifier
2024-08-12 16:21:57,248 DEBUG killing kblueplugd kbluetooth4
2024-08-12 16:21:57,251 DEBUG Disabling systemd-resolved stub resolver during upgrade
2024-08-12 16:21:57,354 INFO cache.commit()

And after the upgrade was complete:

ubuntu@xubuntu:~$ apt policy chromium-browser
chromium-browser:
  Installed: 2:1snap1-0ubuntu2
  Candidate: 2:1snap1-0ubuntu2
  Version table:
 *** 2:1snap1-0ubuntu2 500
        500 http://us.archive.ubuntu.com/ubuntu noble/universe amd64 Packages
        100 /var/lib/dpkg/status
ubuntu@xubuntu:~$ snap info chromium
name: chromium
summary: Chromium web browser, open-source version of Chrome
publisher: Canonical✓
store-url: https://snapcraft.io/chromium
contact: https://bugs.launchpad.net/ubuntu/+source/chromium-browser/+bugs?field.tag=snap
license: unset
description: |
  An open-source browser project that aims to build a safer, faster, and more
  stable way for all Internet users to experience the web.
commands:
  - chromium.chromedriver
  - chromium
snap-id: XKEcBqPM06H1Z7zGOdG5fbICuf8NWK5R
tracking: latest/stable
refresh-date: today at 16:30 EDT
channels:
  latest/stable: 127.0.6533.99 2024-08-12 (2925) 174MB -
  latest/candidate: 127.0.6533.99 2024-08-07 (2925) 174MB -
  latest/beta: 128.0.6613.27 2024-08-08 (2926) 181MB -
  latest/edge: 129.0.6614.3 2024-07-29 (2920) 181MB -
installed: 127.0.6533.99 (2925) 174MB -