It appears what's going on (in my observed case, at least) is that the xfce4 package depends on xfce4-session, which pulls in light-locker as a Recommends, which in turn pulls in lightdm as a dependency. And when Xfce searches for a screen locker to use, it seems to discover light- locker first and tries to use it, which fails if lightdm is not in use. light-locker then signals the SIGTRAP “crash” (from the light-locker source code, this appears to be an intentional as a means of signaling that an error occurred).
So, the workaround appears to be either to use lightdm as the display manager instead, or to manually configure Xfce to use a different screen locker, or to manually remove the light-locker package and install, for instance, xfce4-screensaver (which is not installed by default from the xfce4 or xfce4-goodies metapackages) so that Xfce finds and uses it instead. Then, upon restarting Xfce, screen locking appears to work properly. -- 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
