Comment 85 for bug 699802

I had got the error ("error: no video mode activated." message) after upgrading from 10.04 to 12.04. I have purged grub configuration and error has dissapeared.

These are the magic commands (use carefully when installing grub on partitions, internet connection required):

sudo apt-get purge grub grub-pc grub-common
sudo apt-get install grub-common grub-pc