Ubuntu, x86 or a64

If you're a newbie go for the 32-bit version. The 64-bit version has (largely theoretical for most users) performance gains but you will have problems with plugins etc that are not natively 64-bit.
 
M0KUJ1N is right. If you're using it on your desktop I'd stick with 32-bit. If you're setting up some big honkin' thing that needs 4+ GiB of RAM you'll need the 64-bit version.
 
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