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invalid extent - grub rescue

TRANSLATION I've Ubuntu 12.04 and ArtistX on a laptop with a external HDD. These work great. After this I installed these in two PC and I get the next message on both: -error: invalid extent. ...
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Can't load Windows without plugging in the external drive

My external drive contains Ubuntu and when I don't have it plugged in, I receive an error message with this grub_rescue > . I don't know what this means or how to fix it, but I want to make it as ...