I have installed Ubuntu 12.04 on my computer. The install went fine but now I have the next error while booting:
grub stage 1.5 - error 2
I'm posting from the live CD and I didn't find an useful answer in Google.
Boot from LiveCD and from a terminal run 'grub-install /dev/hda' command and then boot from the hard disk. The command will do a fresh install of grub on your hard disk and overwrite any previous versions of grub. Hopefully this will fix it.