The answer of question #145493 solved the problem. No idea what was the issue, but the update manager doesn't crash anymore and the Ubuntu Software center works again.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/721568 Title: update manager package crashed on start up -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
