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This question already has an answer here:

Is it possible to restore my dual boot PC to 10.04 LTS? I am concerned about rescuing my data if the upgrade to 12.04 has not worked. What options do I have from the grub prompt?

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marked as duplicate by bodhi.zazen, Eric Carvalho, psusi, belacqua, Seth Feb 8 '13 at 1:42

This question was marked as an exact duplicate of an existing question.

    
This question is going to be closed as a duplicate. If you think this is not a duplicate please edit your question to include why and flag this for re-opening. Thanks! – Seth Feb 8 '13 at 1:42

Put a livecd or live usb into the computer, and boot from it. This way you can access your files, and save them to somewhere else.

You cannot restore the 10.04 ubuntu. The only way is to reinstall.

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As the this duplicate says, Ubuntu can be migrated, but it's quite hard. – horIzoN Feb 7 '13 at 15:37

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