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This question already has an answer here:

I want to upgrade from Ubuntu 12.10 to Ubuntu 13.04 but I cant. I downloaded the iso of Ubuntu 13.04 but it's only allowing a clean install. The "software updater" (update manager as it was called in 12.04) only offers an upgrade to Xubuntu.

Is there a way to upgrade to what I want?

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marked as duplicate by Mitch, Eric Carvalho, Jorge Castro, Seth, Thomas Ward Jul 11 '13 at 2:07

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

Try using the following command in the terminal:

sudo do-release-upgrade
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Thanks. It worked. – jackie123 Jul 11 '13 at 1:06

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