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I'm running in a machine with a 64bits CPU, but my kernel shows me (when I use uname -m command) that I'm running on 32bits (686). How can I change the kernel version to use all capacity of my machine?

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up vote 6 down vote accepted

You need to download and install the 64-Bit version of Ubuntu.

There is no way to do a direct upgrade from 32-Bit to 64-Bit.

You can get the X86_64 version from the Ubuntu download site here

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I just can't find the X86_64 version, just the amd64, as you can see on this mirror: – Daniel Cukier Aug 26 '09 at 12:28
Same version. X86_64 or AMD64 both refer to 64Bit – BinaryMisfit Aug 26 '09 at 12:30

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