Comment 14 for bug 951123

ubutn2-fan: My comment was not geared towards you but informing Sebastian as to what it was. And you're correct, it does not work. It doesn't work in software center, or update manager, neither.

I even reported it as so, see:
https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/971564
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/971573

Anyway, I've confirmed it to get the ball rolling. It's not assigned to anybody but hopefully someone will write/apply a patch.