I installed 12.10 and when it finished I restarted it, but it says at the beginning:
Error: file not found, Grub Rescue>
I then tried
sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
The internet is connected, but it says:
Cannot access PPA (https://launchpad.net/api/1.0/~yannubuntu/+archive/boot-repair) to get PPA information, please check your internet connection.
Is there any other way to fix this please?