This is another way to fix the ''GRUB Error Rescue'' problem. A very easy way, that I highly recommend!
All you need is an Ubuntu Live-CD and you're good to go!
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair-ubuntu
All you need is an Ubuntu Live-CD and you're good to go!
sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install boot-repair-ubuntu