The upgrade went fine for a couple hours.
First it download 1100 files, and then configured all of them.
Then it asked me something about SAMBA (I had tried to network with my Windows machines) and asked to compare, and then I closed and then it said that that installation of samba failed. It went on a while longer and then there was a segmentation fault and the machine froze.
I rebooted, and now I end up with a grub menu and have no idea what to do. Please help.