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I've installed ubuntu 12.04 in a dual boot with a windows 7. I've got the ISO months ago to use in another pc (32bit). Now I've got an laptop with windows 7 64-bit, and installed the 32-bit ubuntu. How to proceed, if I want to use a 64-bit version of Ubuntu? Ps: I'm newbie in any Linux OS and in english language. Thanks

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marked as duplicate by bodhi.zazen, Warren Hill, chronitis, Kevin Bowen, Basharat Sialvi Jul 22 '13 at 19:22

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download the 64-bit version and re-install. – Alvar Jul 19 '13 at 14:31

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The 32-bit and 64-bit ISOs are separate. You'll have to download the 64-bit ISO if you want to run 64-bit Ubuntu 12.04.

You can find it here:

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So I need to unistall my current version? – Leonardo Jul 19 '13 at 14:41
That is going to be the easiest way, yes. According to this answer (…) it's not impossible to do, but it is definitely easier to just re-install. – Aaron Jul 19 '13 at 14:44
You do not "uninstall", you simply re-install. The 64 bit install should preserver your data in /home, but I advise you back up any data you wish to keep just in case. – bodhi.zazen Jul 19 '13 at 15:50

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