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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

Leonardo
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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: http://www.ubuntu.com/download/desktop

Aaron
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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 (http://askubuntu.com/questions/5018/is-it-possible-to-upgrade-from-a-32bit-to-a-64bit-installation) 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. – Panther Jul 19 '13 at 15:50