> sudo killall -9 Xorg

This causes some havoc -- as this does not actually stop anything in the
session, random services just start failing the next time they try to
talk to X. Due to our Restart=on-failure, these units then try to
restart a few times until they hit the restart limit and go to "failed".

So this is rather rude -- just log out instead, or do "kill -9 -1" to
kill your user processes.

That said, I think it's ok that services go to "failed" as long as the
next login properly restarts them, which brings us to..

> In general any script which is on graphical-session doesn't get

Indeed this does kill ubuntu-session.target and its associated services
like unity7.service. But we don't configure a requirement in the other
direction, i. e. graphical-session.target does not stop when ubuntu-
session.target stops.

/usr/lib/gnome-session/run-systemd-session has a loop to clean up failed
units, but appparently that's not wide enough yet.

You received this bug notification because you are a member of DX
Packages, which is subscribed to unity-gtk-module in Ubuntu.

  unity-gtk-module.service is racy; session services don't stop if
  session terminates

Status in gnome-session package in Ubuntu:
  In Progress
Status in unity-gtk-module package in Ubuntu:
  Fix Released

Bug description:
  Sometimes on session start unity-gtk-module.service runs too late or
  something, and $GTK_MODULES does not include "unity". It is in
  "systemctl --user show-environment" but not in a terminal bash.

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