Created attachment 621300 [details] patch fixing this issue This seems to be a common problem that GNOME not document well and apps not correctly use GDK threads. Have reported in gnome upstream and many apps met this problem. There is a gnome patch for working around such problem: https://bugs.launchpad.net/ubuntu/+source/gtk+2.0/+bug/1376530 https://github.com/GNOME/gtk/commit/79c3ff3c4ed74bbcc820dac2d5180fa4d48d55ec To vm-install side, without gnome change, this small patch could fix the problem.