Please attach anything vaguely relevant-looking from the system log (systemd Journal if you use systemd, or /var/log/syslog). The bug will probably be somewhere in the vicinity of logind, PAM, dbus-daemon, lightdm, X or XFCE, or possibly graphics drivers in the kernel (which have been known to lock up during fast-user-switching), but without looking at the log it's impossible to say which.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1779667 Title: Unlocking existing session yields black screen. Closing session does not help as affected user cannot open a successful X session until next reboot. Other users are ok. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1779667/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
