Comment 5 for bug 30989

Thank you very much!
What exactly are the criteria for identifying an official Ubuntu source?
You are right, there seems to be no reliable way of handling this. But then, update-manager isn't actually targeted at people using an apt-proxy except for situations where there is an administrator maintaining the proxy and wanting his users to be able to upgrade their release using this nice graphical interface without a headache through the apt-proxy server. Given this case, one would need something to mark an apt source 'official', enabling update-manager to rewrite it. Putting a comment before/after the source entry comes to mind but maybe this is not what one would call a straight forward approach. Should I file a new bug report concerning this problem?