Comment 12 for bug 449535

Documented at <https://wiki.ubuntu.com/KarmicKoala/ReleaseNotes#Upgrade%20from%20beta%20must%20be%20triggered%20manually>:

A bug in the apt package included in the Ubuntu 9.10 Beta prevents automatic notification of available package updates. Users who have installed or upgraded to Ubuntu 9.10 prior to the Release Candidate should ensure that updates are being made available by running update-manager manually, clicking Check, and installing the presented updates. (449535)