Possible Duplicate:
Is it possible to “upgrade” from a 32bit to a 64bit installation?
There was a similar question for older Ubuntu versions, but not for 12.04.
Multiarch is ready now and in Ubuntu 12.04?
Can I upgrade from 32 bit to 64 bit?
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No you can not. Because most of the 32 bit apps will not work in 64bit, need to install all lib (removing 32bit lib) for 64bit. So it's similar to install a new system :) – shantanu Jun 20 '12 at 03:31
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If someone has an answer addressing 12.04 in a more specific way (read as it just works) than was already stated in the other question, please add it as a new answer specific to 12.04. My close vote is based on the fact that we should have one question on the topic with diverse and good answers. – RobotHumans Jun 20 '12 at 04:30
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Also related: How can I switch a 32-bit installation to a 64-bit one? – Eliah Kagan Jun 20 '12 at 05:14