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This question already has an answer here:

How can I upgrade my Ubuntu version to 13.10. My current Ubuntu version is 13.04.

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marked as duplicate by bodhi.zazen, karel, Florian Diesch, mikewhatever, Eric Carvalho Jan 3 '14 at 0:49

This question was marked as an exact duplicate of an existing question.

Open software updater from dash (search) and let it update package lists, If all programs on your computer are up to date it should notify you about the release update.

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