Comment by velshin

The same thing happened during one of my upgrades to 12.04. Grub was hosed.

Here's the fix: http://askubuntu.com/questions/125428/grub-complains-of-no-s...

It's ironic that the top voted comment in this thread is about how wonderful Ubuntu is, followed by how we no longer need "ops" for linux, while further down we have problems like this bootloader update failure that no normal user could surmount.