Public bug reported:
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.
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Critical
Assignee: Brian Murray (brian-murray)
Status: In Progress
** Tags: bionic cosmic
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https://bugs.launchpad.net/bugs/1780342
Title:
lock screen says "Authentication failed" after upgrade to bionic
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