[Bug 1749199] Re: purge conf files on removal of upstart (was session fails to start after an upgrade from xenial to bionic)

[Launchpad Bug Tracker]

This bug was fixed in the package ubuntu-release-upgrader - 1:18.10.3

---------------
ubuntu-release-upgrader (1:18.10.3) cosmic; urgency=medium

  [ Dimitri John Ledkov ]
  * Purge obsolete packages, if user agrees to remove obsolete
    packages. LP: #1749199
  * Make dist-upgrade.py work when PWD != datadir, by fixing the logic for
    finding and loading .release config files with datadir prepended
    first.

  [ Brian Murray ]
  * DistUpgrade/DistUpgradeCache.py: clarify why a package is not removed.

 -- Brian Murray <brian at ubuntu.com>  Wed, 27 Jun 2018 16:34:25 -0700

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: Invalid => Fix Released

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https://bugs.launchpad.net/bugs/1749199

Title:
  purge conf files on removal of upstart (was session fails to start
  after an upgrade from xenial to bionic)

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in xorg package in Ubuntu:
  Fix Released
Status in ubuntu-release-upgrader source package in Bionic:
  Invalid
Status in xorg source package in Bionic:
  Fix Released

Bug description:
  [Testcase]

  1. Launch xenial lxd container
  2. install x11-common upstart
  3. do-release-upgrade to bionic
  4. Upgrade to bionic removes upstart
  5. upgrade to new x11-common, make sure the upstart snippets are gone from disk: /etc/X11/Xsession.d/00upstart
  /etc/X11/Xsession.d/99upstart
  6. for the new release-upgrader, check that upstart is purged, if user selects to remove packages at the end of the do-release-upgrade.

  
  After an upgrade from Xenial to Bionic the session fails to start and returns immediately to the login screen.

  There is this line in the journal
  [...] /usr/lib/gdm3/gdm-x-session[3584]: /etc/X11/Xsession.d/99x11-common_start: ligne 5: /sbin/upstart: Aucun fichier ou dossier de ce type

  (full journal from a failed attempt attached)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-session 3.26.1-0ubuntu9
  ProcVersionSignature: Ubuntu 4.13.0-32.35-generic 4.13.13
  Uname: Linux 4.13.0-32-generic x86_64
  ApportVersion: 2.20.8-0ubuntu8
  Architecture: amd64
  Date: Tue Feb 13 15:11:12 2018
  InstallationDate: Installed on 2018-02-07 (6 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
  ProcEnviron:
   TERM=linux
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-session
  UpgradeStatus: Upgraded to bionic on 2018-02-13 (0 days ago)

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