Greeter auth doesn't unlock unity lockscreen

[Sebastien Bacher]

Using current wily

- use indicator-session to go to the greeter (e.g pick another user in the list)
- select your normal user back
- enter your password

you should go back to an unlocked session but it's still locked...

[Sebastien Bacher (seb128)]

The issue starts with that lightdm update, https://launchpad.net/ubuntu/+source/lightdm/1.16.1-0ubuntu1

The update changes the pam configuration, unsure if that could confuse unity in some way?

[Tyler Hicks (tyhicks)]

I believe this is due to the pam config changes rather than the code changes to lightdm. I commented out the new lines in the pam config files, rebooted, and then verified that the greeter auth works as intended.

[Robert Ancell (robert-ancell)]

I'm having trouble reproducing this as my graphics drivers just show a black screen when X quits.

[N1ck 7h0m4d4k15 (nick-athens30)]

I cannot reproduce this bug in Wily after latest updates.
Please update your system and make sure this still exist.

$ apt-cache policy lightdm
lightdm:
  Installed: 1.16.2-0ubuntu1
  Candidate: 1.16.2-0ubuntu1

[Sebastien Bacher (seb128)]

neither lightdm nor unity changed

[N1ck 7h0m4d4k15 (nick-athens30)]

Tried this again I can reproduce it *only if* I switch to another user(name).

If the system has two (or more) users and I click another username from the indicator but instead I select my current logged-in user and write the password the lock screen blinks and asks for the password a second time. The second time accepts the password and unlocks the session.

If I click the 'Lock/Switch Account' in the indicator, greeter works as it should without problems.

This has been tested with package, https://launchpad.net/ubuntu/+source/lightdm/1.16.2-0ubuntu1

Any other test-case is welcome.

Regards
NickTh

[Robert Ancell (robert-ancell)]

tyhicks / others - does the libaudit functionality work if we revert the PAM configuration? i.e. is it a way forward to revert this PAM change until we work out what the problem is?

[Robert Ancell (robert-ancell)]

I've managed to reproduce on a VM, however commenting out the PAM changes seems to have no effect - it still shows the Unity lockscreen when returning from the greeter.

[Tyler Hicks (tyhicks)]

Robert, you have to reboot the system after reverting the PAM config changes.

[Tyler Hicks (tyhicks)]

Unfortunately, the PAM changes are required for the auditing functionality.

[Tyler Hicks (tyhicks)]

I am ok with reverting the entirety of the libaudit functionality in Wily until I can sort out this bug.

[Robert Ancell (robert-ancell)]

I've uploaded a version to wily with libaudit support disabled.

[Robert Ancell (robert-ancell)]

Also - confirming after reboot the changes worked.

[Launchpad Janitor (janitor)]

This bug was fixed in the package lightdm - 1.16.3-0ubuntu1

---------------
lightdm (1.16.3-0ubuntu1) wily; urgency=medium

  * New upstream release:
    - Fix compile failing without libinput
    - Fix compile failing without Vala
  * debian/lightdm.lightdm-autologin.pam:
  * debian/lightdm.pam:
  * debian/rules:
    - Disable libaudit support for now - Unity is not unlocking with these
      changes (LP: #1498775)

 -- Robert Ancell <email address hidden> Wed, 30 Sep 2015 09:30:57 +1300