I used the update manager per the procedure to upgrade from 12.04 LTS to 12.10. The update manager was replaced by the software center, and I still have 12.04 LTS.
closed as not a real question by mikewhatever, Seth♦, Thomas W., Eric Carvalho, Eliah Kagan Mar 22 '13 at 9:49
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Are you ABSOLUTELY sure you are still on Ubuntu 12.04?
To check, type into terminal, cat /etc/issue This will display the current version.
If it still is, then try laurent's suggestion.