I think it should work, but to be on the safe side backup any /etc/*.conf files and home files on the new setup, at the very least. Gparted is very easy to use to repartition hard drive. You do need to reboot though for the new settings to be read by fstab. I can't remember but think gparted already edits fstab for you. The only problem I can see is you may need to decide which /home/.mozilla/ bookmarks and history, Desktop and so on you want to keep before you restore.
Sorry, need to add that you could use Ubuntu live CD (with gnome desktop) to do the gparted (commandline: gparted)
Last edited by mazinoz; 04-22-2010 at 09:19 PM.