[Bug 1966127] Re: ubuntu-desktop-minimal pulls gnome-session which is in universe

[Jeremy Bicha]

I think this is because ubuntu-desktop-minimal depends on gdm3.
gdm3 Recommends gnome-session | x-session-manager

While ubuntu-session provides x-session-manager, apt is trying the first
choice.

It looks like no official Ubuntu flavor besides the default desktop
version uses gdm3, so it should be safe for us to just add ubuntu-
session first in that recommends list.

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https://bugs.launchpad.net/bugs/1966127

Title:
  ubuntu-desktop-minimal pulls gnome-session which is in universe

Status in gdm3 package in Ubuntu:
  New
Status in ubuntu-meta package in Ubuntu:
  New

Bug description:
  ubuntu-desktop-minimal is in main but installing it pulls gnome-
  session from universe. Here is how to reproduce it:

  1) Create a Jammy VM:
  $ lxc launch images:ubuntu/jammy jammy-vm --vm
  2) Enter the Jammy VM:
  $ lxc shell jammy-vm
  3) Install ubuntu-desktop-minimal
  root at jammy-vm:~# apt-get update
  ...
  root at jammy-vm:~# apt-get install -V ubuntu-desktop-minimal
  ...
  Get:726 http://archive.ubuntu.com/ubuntu jammy/main amd64 libxfont2 amd64 1:2.0.5-1 [94.7 kB]                                           
  Get:727 http://archive.ubuntu.com/ubuntu jammy/main amd64 xwayland amd64 2:22.1.0-1 [932 kB]
  Get:728 http://archive.ubuntu.com/ubuntu jammy/universe amd64 gnome-session all 42.0-1ubuntu1 [15.2 kB]
  Get:729 http://archive.ubuntu.com/ubuntu jammy/main amd64 yaru-theme-gnome-shell all 22.04.2 [66.4 kB]
  Get:730 http://archive.ubuntu.com/ubuntu jammy/main amd64 ubuntu-session all 42.0-1ubuntu1 [5,418 B]
  ...
  4) Check the policy of packages:
  root at jammy-vm:~# apt-cache policy ubuntu-desktop-minimal gnome-session
  ubuntu-desktop-minimal:
    Installed: 1.478
    Candidate: 1.478
    Version table:
   *** 1.478 500
          500 http://archive.ubuntu.com/ubuntu jammy/main amd64 Packages
          100 /var/lib/dpkg/status
  gnome-session:
    Installed: 42.0-1ubuntu1
    Candidate: 42.0-1ubuntu1
    Version table:
   *** 42.0-1ubuntu1 500
          500 http://archive.ubuntu.com/ubuntu jammy/universe amd64 Packages
          100 /var/lib/dpkg/status

  
  Both should be from main.


  Additional information:

  root at jammy-vm:~# lsb_release -rd
  Description:	Ubuntu Jammy Jellyfish (development branch)
  Release:	22.04

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