Comment 5 for bug 1354948

I might have had the same problem as you, but i can't check any of the log files because the computer isn't accessible to me anymore.

The problem i had when grub-install was being ran from the installer was it was trying to install grub to /dev/sda which was the USB device i was actually booting Ubuntu 14.04.2 from. I dropped into a terminal but grub-install wasn't a command. I used the boot repair disk to fix it, you can find that here: https://help.ubuntu.com/community/Boot-Repair