[Bug 1802094] Re: Can not start Flashback session in 18.04 (Bionic) after update from 16.04 (Xenial)

[Chrescht]

apport information

** Tags added: apport-collected bionic package-from-proposed

** Description changed:

  Users authenticate against LDAP. Was fine until I upgraded to Ubuntu
  18.04. /home is nfs mounted.
  
  I've checked all logs I can find, syslog, auth, kern, lightdm, Xorg, .xsession-errors. My main suspect from auth.log is:
  lightdm: pam_systemd(lightdm:session): Failed to create session: Connection timed out
  
  There seems to be a 25 second timeout and if the session isn't ready it
  goes back to the login screen (here lightdm-greeter).
  
  Something else is bugging me: when a given session DOES let me login,
  after restarting lightdm for whatever reason, I won't be able to log
  back in. It's like the lightdm restart doesn't properly terminate, and
  some bad clues are left in the user's home folder so that the next try
  will end in a login loop.
  
  Reinstalling flashback with apt-get install --reinstall gnome-session-flashback didn't help.
  ~/.Xauthority is owned and writable by the owner. This has never been a problem.
  
  No login problem for an old local account.
+ --- 
+ ProblemType: Bug
+ ApportVersion: 2.20.9-0ubuntu7.5
+ Architecture: amd64
+ CurrentDesktop: GNOME-Flashback:GNOME
+ DistroRelease: Ubuntu 18.04
+ InstallationDate: Installed on 2016-12-18 (693 days ago)
+ InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
+ Package: gnome-flashback 3.28.0-1ubuntu1.3
+ PackageArchitecture: amd64
+ ProcVersionSignature: Ubuntu 4.15.0-39.42-generic 4.15.18
+ Tags:  bionic package-from-proposed
+ Uname: Linux 4.15.0-39-generic x86_64
+ UpgradeStatus: Upgraded to bionic on 2018-11-03 (7 days ago)
+ UserGroups: adm adm cdrom cdrom dip dip lpadmin lpadmin plugdev plugdev sambashare sambashare sudo sudo
+ _MarkForUpload: True

** Attachment added: "Dependencies.txt"
   https://bugs.launchpad.net/bugs/1802094/+attachment/5211509/+files/Dependencies.txt

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https://bugs.launchpad.net/bugs/1802094

Title:
  Can not start Flashback session in 18.04 (Bionic) after update from
  16.04 (Xenial)

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