Daniel Kahn Gillmor:
dbus-user-session supports at most one graphical session concurrently
... in order to avoid people encountering the very problem of half-hearted and flawed implementations that I described. Non-half-hearted implementations are the goal, however.
Read https://lists.debian.org/debian-devel/2016/08/msg00554.html and http://www.mail-archive.com/[email protected]/msg01393.html .
