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I'm aware of the How do I upgrade to the development release (aka. Ubuntu+1)? question and this is NOT a duplicate.

On my laptop running Ubuntu 12.10, when running sudo update-manager -d, I'm getting "The software on this computer is up to date".

Running sudo do-release-upgrade -d starts the upgrade procedure

Is it a (temporary) bug in Update Manager which is going to be fixed or is it a change which makes our "canonical" answer obsolete? Or am I doing something wrong?

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I don't think you need to use sudo for upgrading using update-manager. – jokerdino Feb 3 '13 at 12:12
@jokerdono: I tried running update-manager -d without sudo - it still does not see the new release. – Sergey Feb 3 '13 at 13:08
Look, you will need to have the software-source correctly configured in order to get the updates. Otherwise, you will get the "Your computer is up-to-date" message. – Lucio Aug 9 '13 at 4:59
@Sergey could you add your sources.list file? Be sure that in the Software Sources, Updates tab, Release Updates option is in "Normal Releases". – Braiam Aug 16 '13 at 15:07

Go to System Settings --> Software & Updates, then in the Software & Updates window, go to the Updates tab. Change the option Notify me of a new Ubuntu version to For any new version. Then go back and run update manager.

Basically the default setting only lets you upgrade to LTS versions and 13.04 is not LTS.

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