Comment 3 for bug 1328957

From http://askubuntu.com/questions/260297/12-04-2-failed-to-install-grub-efi-to-target:

>This error was solved for me by making sure there was an internet connection available to the installer.
>When I chose not to connect I got this error.

I tried this workaround, and this time the installation concluded correctly, but the new installation won't boot, it kicks me to Grub rescue.