We moved system init to systemd a while ago, but we still have and maintain the upstart package for the session startup. As this is unmaintained, we should remove this dependency by the next LTS.

Discuss and investigate what we currently use upstart for, what the original reasons were for moving away from gnome-session and/or D-Bus activation, and check how we can migrate the user upstart jobs to something else (gnome-session/xdg-autostart, D-BUS activation, or the user systemd).