[Bug 2025462] Re: Apt deletes ubuntu-desktop during dist-upgrade

[Julian Andres Klode]

I believe this is a regression from
https://bugs.launchpad.net/ubuntu/+source/python3.10/+bug/1990586 which
I know sounds hilarious because it was fixing another issue like this
but here is what I believe happened:

- mutter and gnome-shell were released on the same day
- gnome-shell was eligible to be upgraded on the machine, mutter was still phasing
- with the change, we marked mutter for keep back
- the upgrade resolution ran, it was not able to upgrade gnome-shell anymore because it depends on the new mutter.

Before fixing the other bug, phasing had no effect on the resolution of
the upgrade, and then we reverted the upgrade paths depending on the
phasing, which resulted in no removals due to phasing. But the upgrade
problems became to complex, breaking the solver.

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https://bugs.launchpad.net/bugs/2025462

Title:
  Apt deletes ubuntu-desktop during dist-upgrade

Status in apt package in Ubuntu:
  Incomplete

Bug description:
  This morning I got surprised by my laptop booting to a tty instead of
  a desktop environment. It turned out that the entire desktop
  environment was no longer present on my machine. Doing an apt install
  ubuntu-desktop-minimal resolved the issue.

  The machine had been running for a while. Looking at the apt logs, it
  looks like apt deleted ubuntu-desktop on its own during a dist-upgrade
  a couple of weeks back.

  Start-Date: 2023-06-08  14:20:46
  Commandline: apt dist-upgrade
  Requested-By: alex (1000)
  Upgrade: gnome-shell-common:amd64 (44.0-2ubuntu3, 44.1-0ubuntu1)
  Remove: gnome-shell:amd64 (44.0-2ubuntu3), ubuntu-desktop:amd64 (1.501), gdm3:amd64 (44.0-1ubuntu1), gnome-shell-extension-desktop-icons-ng:amd64 (46+really47.0.2-3), gnome-shell-extension-appindicator:amd64 (53-1), ubuntu-session:amd64 (44.0-1ubuntu1), gnome-shell-extension-manager:amd64 (0.4.0-1), gnome-shell-extension-ubuntu-dock:amd64 (79ubuntu2.23.04.1), ubuntu-desktop-minimal:amd64 (1.501)
  End-Date: 2023-06-08  14:20:48

  I'm using the following version of Ubuntu:
  Distributor ID:	Ubuntu
  Description:	Ubuntu 23.04
  Release:	23.04
  Codename:	lunar

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