Comment 67 for bug 66637

I have been having the same problems: I recently installed Feisty in my laptop and it would grind to a halt, thrashing until I couldn't do anything. Suspend to disk failed. It took days until I did track the problem to the fact it was not using my swap partition because the uuid created in my /etc/fstab wasn't the same as in the physical partition. The swap partition's uuid would change unpredictably, and I had to adopt the notation /dev/hdaX in my /etc/fstab to actually be able to use my swap partition. see bug #67437 as well.