Logging out of Lubuntu does not fully terminate earlier logged-in sessions

[Aaron Rainbolt]

Note that this bug is not actually a problem in lxqt-build-tools, but I have yet to determine which package it's in. I'll update the package once I find it.

In Lubuntu 23.04 and higher, logging out of the desktop appears to terminate the apps in a user's session, but running `loginctl` reveals that the session is still logged in. Logging in and out multiple times results in sessions piling up.

To reproduce:

1: Boot Lubuntu 23.04 or later (24.04 is where we first found this).
2: Sign in.
3: Log out.
4: Repeat steps 2 and 3 several times.
5: Sign in once more, then open QTerminal.
6: Run `loginctl`.

Expected behavior: One (or *maybe* two) active sessions should be displayed.

Actual result: There will be at least one active session displayed for every login/logout cycle.

Additional info: This does not happen on Lubuntu 22.04 out of the box or after upgrading. However, it *does* happen if you install the Lubuntu Backports onto 22.04. So this is virtually guaranteed to be LXQt-related.

[Aaron Rainbolt (arraybolt3)]

It's SDDM's fault - I can reproduce this using the Openbox session too.

[Aaron Rainbolt (arraybolt3)]

grrr... no, it's not SDDM's fault apparently, upgrading it in a 22.04 VM didn't cause the issue to appear! Still hunting.

[Aaron Rainbolt (arraybolt3)]

Finally pinned it down by upgrading packages a little bit at a time from Backports on a Lubuntu 22.04 LTS VM. Upgrading lubuntu-update-notifier triggers the bug.

[Aaron Rainbolt (arraybolt3)]

This has been solved in Noble with the new updater.