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Because on the front page it says 32 bits is for less than 2Go...

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marked as duplicate by Jorge Castro, Alvar, user68186, Eric Carvalho, LiveWireBT Oct 23 '13 at 18:19

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

    
What CPU do you have? –  Mitch Oct 23 '13 at 16:56

1 Answer 1

If your CPU is 32 bit then you would install 32 bit Ubuntu.

A 32-bit OS will run on a 32-bit or 64-bit processor without any problem.
A 32-bit application will run on a 32-bit or 64-bit OS without any problem.
But a 64-bit application will only run on a 64-bit OS and a 64-bit OS will only run on a 64-bit processor.

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