On 2016-03-09, Sven Arvidsson <s...@whiz.se> wrote: > On Tue, 2016-03-08 at 20:13 -0600, Dennis Wicks wrote: >> I fill in user-id and password, click "Sign In" and the=C2=A0 >> screen goes blank, flashes a few times, then comes right=C2=A0 >> back to the sign in screen. Trying to log on with root does=C2=A0 >> the same thing, even though I am supposed to be able to do it. >>=20 >> I can logon at terminal screens (ctl-alt-f1 etc) with either=C2=A0 >> my personal userid or as root with no problem. >>=20 >> In case it makes a difference, Jessie AMD64 >>=20 >> Many TIA!! >> Dennis >>=20 > > The display manager is most likely crashing. You need to examine logs > and figure out why.
I would say that the user's X session is crashing, not the display manager. Assuming a default jessie setup , the command journalctl /usr/bin/gnome-session (run as root) might yield some useful diagnostic information. The file /var/log/Xorg.0.log might be helpful too. -- Liam