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Possible Duplicate:
I upgraded from an alpha or beta - am I up to date if I keep upgrading?

How to upgrade to 12.04 beta 1 from 12.04 alpha 2?

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marked as duplicate by Jorge Castro, jokerdino, ajmitch, James Henstridge, Bruno Pereira Mar 2 '12 at 10:20

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.

Same solution in those answers apply. – Jorge Castro Mar 2 '12 at 5:55
up vote 1 down vote accepted

You simply use apt-get

sudo apt-get update
sudo apt-get upgrade
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