Removing "Startup Applications" in "Ubuntu Software" makes the system unable to launch GDM

[Shih-Yuan Lee]

Removing "Startup Applications" in "Ubuntu Software" makes the system unable to launch GDM

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-session-bin 3.28.0-0ubuntu1
ProcVersionSignature: Ubuntu 4.15.0-12.13-generic 4.15.7
Uname: Linux 4.15.0-12-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Mar 19 12:54:57 2018
InstallationDate: Installed on 2018-03-15 (4 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180314)
SourcePackage: gnome-session
UpgradeStatus: No upgrade log present (probably fresh install)

[Jeremy Bícha (jbicha)]

We need to write AppStream metadata for gnome-session-properties and add the compulsory_for_desktop field. It's the opposite of what this patch does:
https://salsa.debian.org/gnome-team/epiphany-browser/blob/debian/master/debian/patches/dont-make-compulsory.patch

Alternatively, we could add a new binary package for the gnome-session-properties app to actually allow it to be uninstalled.

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-session - 3.28.0-0ubuntu4

---------------
gnome-session (3.28.0-0ubuntu4) bionic; urgency=medium

  * Split gnome-startup-applications to a separate binary package so
    that it can be uninstalled without breaking the system (LP: #1756788)
  * Have gnome-session-bin recommend gnome-startup-applications
    to try to make this change less disruptive at this late point in the
    Ubuntu release cycle

 -- Jeremy Bicha <email address hidden> Mon, 09 Apr 2018 11:42:46 -0400