I worked around this by commenting out the last 3 lines of /etc/apt/apt.conf.d/50appstream.
-- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to appstream in Ubuntu. https://bugs.launchpad.net/bugs/1547428 Title: Fails to update packages in apport-retrace To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/appstream/+bug/1547428/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs