Problems after upgrade to Gutsy

[Jef Driesen]

Yesterday, I upgraded my desktop from Feisty to Gutsy. At the last stage 
of the upgrade, when I was asked to remove obsolete packages, the X 
server became unresponsive. At that point I did restart the X server 
(over ssh from my laptop). I checked with synaptic for problems, but 
everything appeared to be fine.

But after rebooting the system, I can't mount some of my partitions. I 
get an error "Resource busy or already mounted" (or something similar 
because I did not write it down). My /etc/fstab has entries with UUID's. 
But I also tried with /dev/sdax and it makes no difference. But it does 
work with /dev/mapper/sdax! But I don't understand why.

Note: I also have some partitions on lvm (/, /home and swap) and they 
worked fine after the upgrade.