See also https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1509711 and https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1581384
See also https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-screensav er/+bug/ 1509711 and https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-screensav er/+bug/ 1581384