Comment 0 for bug 1749199

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)