Error out of disk, grub rescue

I installed Ubuntu via usb with no problems, but when I restart, I get an error message:

error out of disk" 'grub rescue.

How can I fix this?

Solution 1:

Apparently this error occurs when GRUB can't find a usable grub.cfg. Since the boot configuration isn't there, GRUB drops you to the grub-rescue prompt. Following these instructions you should be able to boot Ubuntu.

Once you've booted Ubuntu, reinstall GRUB2 by running

sudo grub-install
sudo update-grub2

Solution 2:

For anyone who might be searching for a solution: I had this problem after a fresh install of Ubuntu 11.04 on my HP nc6400 laptop. The problem was solved by installing Ubuntu via the alternate installation cd. http://www.ubuntu.com/download/ubuntu/alternative-download