No crash. The test case gives the expected result with http://launchpad.net/ubuntu/+source/update-manager/1:0.196.12
$ unset DISPLAY $ update-manager
(update-manager:15801): Gtk-WARNING **: cannot open display: $
No crash. The test case gives the expected result with http:// launchpad. net/ubuntu/ +source/ update- manager/ 1:0.196. 12
$ unset DISPLAY
$ update-manager
(update- manager: 15801): Gtk-WARNING **: cannot open display:
$