OK, having followed your argumentation I agree with you that it is a bug.
So I am tagging "regression" and marking as Confirmed.
Let's see what the dev's think about that...
** Tags added: regression
** Changed in: update-manager (Ubuntu)
Status: New => Confirmed
--
no longer reports installed and available versions
https://bugs.launchpad.net/bugs/182350
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs