After installing the xfce4 packages in Ubuntu 20.04 and starting a xfce4 session from the default bootup login screen, I immediately get a similar crash notification. If I launch light-locker from a terminal, I get the following output:
$ light-locker ** (light-locker:26216): ERROR **: 19:33:17.519: Environment variable XDG_SESSION_PATH not set. Is LightDM running? zsh: trace trap (core dumped) light-locker -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1745259 Title: light-locker crashed with signal 5 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/light-locker/+bug/1745259/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs