Quote:
Alert /dev/disk/by-uuid/20a186be-1e98-42df-b68f-3877eadce714 does not exist
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If you look at a grub.cfg file, the entries all point to a specific uuid and the error above is indicating it is looking for a partition with that uuid and it does not exist. Boot the Mint install disk and go to the site below, download and run the bootinfoscript. Post the output, a results.txt file here and someone should be able to give you some clarification.
http://sourceforge.net/projects/bootinfoscript/