Comment 2 for bug 997200

Confirming; we even have a nice fix for this at the NetworkManager level via connectivity checking, but it was new and disruptive enough to not make it in 12.04 -- we're going to be enabling this in the development release very very soon.

Also confirming for update-manager: I've run into the same issue before as well. update-manager/apt ought to distinguish between the type of data being recovered by the downloads, and have a way to gracefully handle these evil captive portals.