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I had installed ubuntu 10.04 (dual boot with windows 7) and have been using it for a long time. Now i need to upgrade to 12.04 or 12.10 and i have downloaded the update file. I need to know how to manually perform the update process - can anyone guide me to a step-by-step instruction or just point me in the right direction ?

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Please look here –  Danatela Jul 23 '13 at 7:05
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marked as duplicate by Mitch, Kevin Bowen, Warren Hill, Eric Carvalho, Stephen Myall Jul 23 '13 at 12:34

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