Thank you, GParted LiveCD\!

I've just used GParted for the first time. It worked fabulously for me. Resizing a partition by 14 GB and moving the other one out of the way in below 10 minutes and without any problems. The biggest problem was that the current version was not working with the Ubuntu USB boot disk creator. There was some kind of problem with isolinux or syslinux. So I just replaced it with the much preferred GRUB. (grub-install /dev/sdb1). Then I entered the settings manually and the rest was easy. I'm normally not a GNOME user, but I really love how (once booted) it just works\!