This one looks like a race-condition. Do you have "Download all updates in the background" enabled or a similar option enabled in software- properties?
** Changed in: update-manager (Ubuntu)
Status: Unconfirmed => Confirmed
--
[apport] update-manager crashed with SystemError in requiredDownload()
https://launchpad.net/bugs/83561
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
