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Is it possible to “upgrade” from a 32bit to a 64bit installation?

I've got a pc with a 64-bit processor but somehow got stuck on the 32-bit version of 11.10. Is there some way to switch to 64-bit without having to back everything up and do a clean install?

merged by Marco Ceppi Aug 15 '12 at 17:26

This question was merged with Is it possible to “upgrade” from a 32bit to a 64bit installation? because it is an exact duplicate of that question.

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