Comment 229 for bug 1289977

I got my machine too boot again:

* I Used the Super Grub Disk to boot into the existing installation on my laptop
* I checked /etc/mtab to see which device was mounted (in my case /dev/sda)
* then I ran "sudo grub-install --boot-directory=/boot /dev/sda"

For people using the Super Grub Disk: selecting the mysterious option "everything" will enable you to select the existing boot configuration on your hard disk. If you booted from an external CD drive, you can remove it after booting.

The boot repair disk was not an option. It refuses to boot when burned to CD, adding the repository failed (the command add-apt-repository does not exist), and downloading the debs only gives a message "enresolvable dependencies", even when extra library debs were downloaded and tried first.