I have Ubuntu 12.04 LTS 64-bit installed on my desktop PC, and it was working fine until a short while ago. I tried to reboot into Ubuntu after removing a Kubuntu installation from my PC and resizing my Ubuntu partition using my 11.10 live CD. When I rebooted, grub showed a black screen and said
Error: no such partition
grub rescue >_
I booted into my live CD again, Ubuntu was still installed and all my data was still there. I still cannot boot into Ubuntu. What should I do?