[Bug 1780342] Re: lock screen says "Authentication failed" after upgrade to bionic

[Brian Murray]

** Also affects: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided
       Status: New

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
       Status: New => In Progress

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
   Importance: Undecided => Critical

** Changed in: ubuntu-release-upgrader (Ubuntu Bionic)
     Assignee: (unassigned) => Brian Murray (brian-murray)

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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:
  In Progress

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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