Unity greeter indicators don't show on second launch

Status changed to 'Confirmed' because the bug affects multiple users.

Robert, could you have a look to that issue?

 It's easy to reproduce:
- log in an uptodate xenial system
- start a guest session
- close it

-> the greeter only has the custom a11y indicator

Looking a bit more it seems the greeter session bus fails to start which makes indicators to bail out (there is an error in the greeter log "Failed to launch bus: Failed to connect to session bus"), it also makes unity-settings-daemon not work properly it seems (resolution is wrong when screen configs change)

This occurs on the second launch of the greeter.

The problem does not occur using the latest lp:lightdm/1.18

Looks like this commit fixes it:

revno: 2327
committer: Robert Ancell <email address hidden>
branch nick: 1.18
timestamp: Wed 2016-06-29 15:16:05 +1200
message:
  Remove unused unititialized file descriptors - could cause stdin to be closed

thanks Robert, I can confirm that this patch applied on the current xenial package fixes the issue

I've made a release with just this change (1.18.2-0ubuntu2).

Hello Roman, or anyone else affected,

Accepted lightdm into xenial-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/lightdm/1.18.2-0ubuntu2 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 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 to verification-done. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed. In either case, details of your testing will help us make a better decision.

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

Updating from xenial-proposed fixes the problem:

~# apt-cache policy lightdm
lightdm:
  Installed: 1.18.2-0ubuntu2
  Candidate: 1.18.2-0ubuntu2
  Version table:
 *** 1.18.2-0ubuntu2 500
        500 http://archive.ubuntu.com/ubuntu xenial-proposed/main i386 Packages
        100 /var/lib/dpkg/status
     1.18.2-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial-updates/main i386 Packages
     1.18.1-0ubuntu1 500
        500 http://archive.ubuntu.com/ubuntu xenial/main i386 Packages

I can confirm that the 1.18.2-0ubuntu2 version fixes the problem for me too

Mostly for the records, I've had a very similar, but more severe problem. Since upgrading from 14.04 to 16.04, not only were the indicators (other than a11y) missing, but I couldn't log in anymore. The correct password was reproducibly rejected as incorrect. After the next restart of lightdm, things worked smoothly, until the next logout. I'd reckon that the same cause that kept the indicators from loading kept lightdm from connecting to its source of authentication (PAM?), but that's highly guesswork.

The new 1.18.2-0ubuntu2 so far seems to have fixed that variant of the problem, too.

This bug was fixed in the package lightdm - 1.18.2-0ubuntu2

---------------
lightdm (1.18.2-0ubuntu2) xenial; urgency=medium

  * debian/patches/lp1605117.patch:
    - Fix stdin being accidentally closed, causing indicators not to show in
      unity-greeter (LP: #1605117)

 -- Robert Ancell <email address hidden> Fri, 29 Jul 2016 15:18:41 +1200

The verification of the Stable Release Update for lightdm has completed successfully and the package has now been released to -updates. Subsequently, the Ubuntu Stable Release Updates Team is being unsubscribed and will not receive messages about this bug report. In the event that you encounter a regression using the package from -updates please report a new bug using ubuntu-bug and tag the bug report regression-update so we can easily find any regressions.