Comment 1 for bug 775369

This is hardly a bug in update-manager. The output of "aptitude why gnome-screensaver" on my system indicates that ubuntu-desktop depends on gnome-screensaver. You may be able to work around this by installing a dummy equivs package, or perhaps by setting the status of xscreensaver to "hold". I don't see why your xscreensaver gets removed, though; nothing in ubuntu-desktop or gnome-screensaver appears to declare a conflict. Perhaps you could expand on this (and perhaps also link to a separate bug explaining why you think gnome-screensaver is broken)?