Comment 42 for bug 127263

I followed the fix here and it works http://www.go2linux.org/upgrading-to-gutsy

Populating the file /var/lib/update-manager/meta-release with the attatched file fixes the issue.

Original source:
http://www.go2linux.org/pics/other_files/meta-release.txt
Note: this is not my fix, thanks to Patrick and Projekt Enterprises, whoever they are.