This seems to be the relevant Ubuntu bug, reported as fixed with a new version of aptdaemon (0.43+bzr756-0ubuntu1) ::
https://bugs.launchpad.net/ubuntu/+source/aptdaemon/+bug/849745 -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
