As a workaround you can run Mir natively using the option: --vt 1 Then just switch to it with Ctrl+Alt+F1/F7
** Summary changed: - mir_proving_server assert failure: mir_proving_server: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. + Mir on X11 server crashed: mir_proving_server: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. ** Information type changed from Private to Public ** Also affects: mir Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1497547 Title: Mir on X11 server crashed: mir_proving_server: ../../src/xcb_io.c:274: poll_for_event: Assertion `!xcb_xlib_threads_sequence_lost' failed. To manage notifications about this bug go to: https://bugs.launchpad.net/mir/+bug/1497547/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs