[Bug 1920412] Re: update-notifier should not depend on gnome-shell

[Norbert]

$ ls /etc/X11/Xsession.d/ -1 | grep gnome
55gnome-session_gnomerc
$ dpkg -S 55gnome-session_gnomerc
gnome-session-common: /etc/X11/Xsession.d/55gnome-session_gnomerc
$ aptitude why gnome-session-common
i   ubuntu-mate-desktop Depends    update-notifier                         
i A update-notifier     Depends    gnome-shell | notification-daemon       
i A gnome-shell         Recommends ubuntu-session | gnome-session          
i A gnome-session       Depends    gnome-session-common (= 3.38.0-3ubuntu2)
$ aptitude why gnome-shell
i   ubuntu-mate-desktop Depends update-notifier                  
i A update-notifier     Depends gnome-shell | notification-daemon

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https://bugs.launchpad.net/bugs/1920412

Title:
  update-notifier should not depend on gnome-shell

Status in update-notifier package in Ubuntu:
  New

Bug description:
  The update-notifier package should not depend on gnome-shell, this
  wrong dependency forces gnome-shell to be installed on fresh minimal
  system while running `sudo apt-get install ubuntu-mate-desktop` on it.

  ProblemType: Bug
  DistroRelease: Ubuntu 21.04
  Package: update-notifier 3.192.40
  ProcVersionSignature: Ubuntu 5.11.0-11.12-generic 5.11.0
  Uname: Linux 5.11.0-11-generic x86_64
  ApportVersion: 2.20.11-0ubuntu60
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CurrentDesktop: MATE
  Date: Fri Mar 19 22:48:30 2021
  SourcePackage: update-notifier
  UpgradeStatus: Upgraded to hirsute on 2021-02-21 (26 days ago)

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