Public bug reported:

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)
 PATH=(custom, no user)
SourcePackage: gnome-session
UpgradeStatus: Upgraded to bionic on 2018-02-13 (0 days ago)

** Affects: gnome-session (Ubuntu)
     Importance: Critical
         Status: Triaged

** Affects: upstart (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: amd64 apport-bug bionic rls-bb-incoming

** Attachment added: "journalctl.log"

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  Session fails to start after an upgrade from Xenial to Bionic
  (leftover from upstart)

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