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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 boot-repair and:

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?

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There is another way, but is more complex. In this post you have all the necessary information. –  Lucio Nov 26 '12 at 18:55

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