I have a dual boot of Win7 and Ubuntu on my HP laptop. I upgraded from Ubuntu 11.10 to 12.04 today and on restart I got a different black Grub screen instead of the usual purple one. (GNU GRUB version 1.99-21ubuntu3.1) Each boot option only returns error messages.
error: no such partition.
I read on some other posts that I should make a live CD and boot there to use the boot repair tool but my laptop wont boot from the disk.
I have changed the BIOS setting so that boot from disk is first and also tried telling it to boot from CD in the Startup Menu. Each time I restart however the CD drive starts to run and then the Grub menu appears.
The CD runs fine on another laptop and is the correct 64bit version.