Updated from 12.04 to 12.10. Ubuntu won't startup. Wouldn't reach login screen. I booted Ubuntu from disc, and did boot repai, then restarted, and went to a terminal like thing with prompt "grub>". Please help. Here's link http://paste.ubuntu.com/6707006/
From the boot-repair log it was clearly shown that there was no sign of installed Ubuntu os on the HDD.