Comment 2 for bug 1565178

I have included a workaround for this on the patch attached to Bug 1565178.

There I have added a gnome-session inhibitor to block the screensaver, on Ubuntu GNOME we will leave this running do if the user exits the installer (rather than press restart button). They will have no screen lock until the next reboot, seems somewhat better than a locked screen to can't be unlocked.