[Bug 1780342] Please test proposed package

[Łukasz Zemczak]

Hello Brian, or anyone else affected,

Accepted ubuntu-release-upgrader into bionic-proposed. The package will
build now and be available at https://launchpad.net/ubuntu/+source
/ubuntu-release-upgrader/1:18.04.21 in a few hours, and then in the
-proposed repository.

Please help us by testing this new package.  See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation on how
to enable and use -proposed.Your feedback will aid us getting this
update out to other Ubuntu users.

If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested and change the tag from
verification-needed-bionic to verification-done-bionic. If it does not
fix the bug for you, please add a comment stating that, and change the
tag to verification-failed-bionic. In either case, without details of
your testing we will not be able to proceed.

Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification .  Thank you in
advance!

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https://bugs.launchpad.net/bugs/1780342

Title:
  lock screen says "Authentication failed" after upgrade to bionic

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

Bug description:
  After an upgrade from Ubuntu 16.04 to Ubuntu 18.04 was completed I
  left the system running and did not reboot it. Later on the lock
  screen kicked in and there was no password dialog anymore, I only saw
  "Authentication failed" and could not log into the system. Lines
  similar to the following can be found in the system's journal:

  The following lines are displayed in the journal:
  juil. 04 09:27:07 ubuntu compiz[1692]: PAM unable to dlopen(pam_unix.so): /lib/security/pam_unix.so: Ne peut ouvrir le fichier d'objet partagé: Aucun fichier ou dossier de ce type
  juil. 04 09:27:07 ubuntu compiz[1692]: PAM adding faulty module: pam_unix.so
  juil. 04 09:27:07 ubuntu compiz[1692]: PAM unable to dlopen(pam_systemd.so): /lib/security/pam_systemd.so: Ne peut ouvrir le fichier d'objet partagé: Aucun fichier ou dossier de ce type
  juil. 04 09:27:07 ubuntu compiz[1692]: PAM adding faulty module: pam_systemd.so

  This is because the gnome-session-inhibit call is terminated after the
  upgrade completed.

  [Test Case]
  1) Setup the lock screen on an Ubuntu 16.04 system running Unity
  2) Upgrade from 16.04 to 18.04 using do-release-upgrade or update-manager -d
  3) Do not reboot, wait for the lock screen to take effect
  4) Observe that you cannot log in anymore

  With the version of ubuntu-release-upgrader from -proposed the lock
  screen will not kick in after the upgrade.

  [Regression Potential]
  Its possible the check for Unity in XDG_CURRENT_DESKTOP is incorrect and the lock screen can still kick in.

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