from the stacktrace on errors.u.c, it looks like that is happening under wayland. It looks to me like Xwayland under the gdm3 gnome-shell greeter session is the one that is crashing. This runs under wayland by default.
** Also affects: gdm3 (Ubuntu) Importance: Undecided Status: New ** Changed in: gdm3 (Ubuntu) Status: New => Confirmed ** Changed in: gdm3 (Ubuntu) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1505409 Title: gnome-shell crashed with SIGTRAP in x_io_error() from _XIOError() from _XEventsQueued() from XPending() from gdk_check_xpending() To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/1505409/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs