[SRU] Ubuntu Unity takes 90 seconds to log out

[Simon Quigley]

[ Impact ]

Ubuntu Unity reliably takes 90 seconds to log out. This is due to the user-level gnome-session.service systemd unit not properly terminating gnome-session on logout. An attempt is made to send SIGTERM to the process, which gnome-session does not care about.

Instead, gnome-session-quit should be invoked when the systemd unit shuts down, which acts effectively and immediately.

[ Test Plan ]

Actual behavior:
 1. Log in to a Unity session on Ubuntu Unity 24.04.
 2. Log out of Ubuntu Unity.
 3. Observe that only the wallpaper is shown for 90 seconds prior to the login manager showing again.

Expected behavior:
 1. Log in to a Unity session on Ubuntu Unity 24.04.
 2. Log out of Ubuntu Unity.
 3. Observe that logging out takes a few seconds at most, and you are able to log back in as the same user, or a different one.

[ Where problems could occur ]

If the gnome-session or gnome-session-quit binaries change the arguments they accept by default, log in and log out functionality on Unity sessions are likely to break.

Additionally, if lightdm or systemd changes in a non-reverse-compatible way, this increases the chance of a user-facing regression.

[Ubuntu QA Website (ubuntuqa)]

This bug has been reported on the Ubuntu ISO testing tracker.

A list of all reports related to this bug can be found here:
http://iso.qa.ubuntu.com/qatracker/reports/bugs/2063383

[Steve Langasek (vorlon)]

Hello Simon, or anyone else affected,

Accepted gnome-session into noble-proposed. The package will build now and be available at https://launchpad.net/ubuntu/+source/gnome-session/46.0-1ubuntu4.1 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, what testing has been performed on the package and change the tag from verification-needed-noble to verification-done-noble. If it does not fix the bug for you, please add a comment stating that, and change the tag to verification-failed-noble. 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 for helping!

N.B. The updated package will be released to -updates after the bug(s) fixed by this package have been verified and the package has been in -proposed for a minimum of 7 days.

[Benjamin Drung (bdrung)]

I'll test this fix (since I am experience the bug).

[aein (aeinner)]

Proposed package (gnome-session/46.0-1ubuntu4.1) partially fixed this bug for me. When some applications are running (Microsoft Teams in my case) logout takes long time ~90 seconds. Without any running applications logout works as expected.

[Benjamin Drung (bdrung)]

I did not fix it for me. The logout still takes a long time (could be around a minute / 90 seconds) even with no applications running.

```
$ dpkg -l | grep 46.0-1ubuntu4.1
ii gnome-session 46.0-1ubuntu4.1 all GNOME Session Manager - GNOME 3 session
ii gnome-session-bin 46.0-1ubuntu4.1 amd64 GNOME Session Manager - Minimal runtime
ii gnome-session-common 46.0-1ubuntu4.1 all GNOME Session Manager - common files
ii gnome-startup-applications 46.0-1ubuntu4.1 amd64 Startup Applications manager for GNOME
ii ubuntu-session 46.0-1ubuntu4.1 all Ubuntu session with GNOME Shell
ii unity-session 46.0-1ubuntu4.1 all Unity session, previous ubuntu default experience.
```

[Mauricio Faria de Oliveira (mfo)]

Marking this SRU as verification-failed per comments
- #4 (partial failure with applications running) and
- #5 (failure even without applications running).

The partial failure would seem like a regression too,
since the bug description says that the fix / change
acts 'effectively and immediately', not conditionally
on running applications:

> gnome-session-quit should be invoked when the systemd unit shuts down,
> which acts effectively and immediately.

Please revert the tag flip if there are other reasons. Thanks!

[Mauricio Faria de Oliveira (mfo)]

Hi Simon,

Just following up on this bug's failed verification (per above).

Could you please clarify the next steps, when you have a chance?
(e.g., an incremental fix to noble-proposed will be uploaded,
or maybe the existing fix in noble-proposed should be removed
if that may not happen soon; or the assessment above is wrong?)

Thanks!