Since it is xserver that crashes, it is not a bug in gnome-screensaver. Client should never be able to crash the server. I confirm this here (with oowriter starting) and will try to link to freedesktop #8537, that has already a patch.
Discord: please provide your Xorg.0.log, it has valuable information about the crash at the end, so that we can confirm it is the same bug. ** Changed in: gnome-screensaver (Ubuntu) Sourcepackagename: gnome-screensaver => xorg-server Status: Unconfirmed => Confirmed -- crashes with dual displays and no xinerama https://launchpad.net/bugs/68135 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs