I'm trying to rescue an Ubuntu installation from an "upgrade" (Gutsy Gibbon -> Hardy Heron, in case it matters to anyone) that seemed to go swimmingly right up until it came time to restart the system. Then the warnings (from the "bearded ones" in the Linux User's Group) about how "painful" that can be were suddenly made manifest.
Dealing with that is guaranteed to chew up the rest of the evening...and probably then some. I'll spare my gentle reader the blow-by-blow, however.
Hope that your evening is going better than mine.