Could you follow the instructions at https://bugs.launchpad.net/ubuntu/+source/gnome-system-tools/+bug/458883/comments/24 and confirm that it fixes your problem? I'm almost sure it does.
Could you follow the instructions at https:/ /bugs.launchpad .net/ubuntu/ +source/ gnome-system- tools/+ bug/458883/ comments/ 24 and confirm that it fixes your problem? I'm almost sure it does.