This bug is still on 15.10, trying `sudo ubuntu-bug /var/crash/_usr_bin_metacity.1000.crash` opens the dialogue, but it closes itself before submission. May I upload the crash file?
syslog has: Feb 2 19:08:34 joran gnome-session[2014]: [xcb] Unknown sequence number while processing queue Feb 2 19:08:34 joran gnome-session[2014]: [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called Feb 2 19:08:34 joran gnome-session[2014]: [xcb] Aborting, sorry about that. Feb 2 19:08:34 joran gnome-session[2014]: metacity: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. Feb 2 19:08:37 joran gnome-session[2014]: gnome-session[2014]: WARNING: Application 'metacity.desktop' killed by signal 6 Feb 2 19:08:37 joran gnome-session[2014]: WARNING: Application 'metacity.desktop' killed by signal 6 Feb 2 19:08:37 joran gnome-session[2014]: Unrecoverable failure in required component metacity.desktop -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1535906 Title: X crashes with gnome-session: Fatal IO error 11 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1535906/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs