This issue has been reported on IRC today. The problem seems to trace back to a locally-installed package with a non-utf8 maintainer field:
Package: davmail Maintainer: Micka�l Guessant <mgues...@free.fr> Of course, this package fails to comply with Debian policy, but that clearly didn't stop the user from being able to install it - which means the data is in the system and we need to be able to cope with it. I'm not sure if this needs to be fixed in ubuntu-drivers or in python- apt. Reassigning to ubuntu-drivers for the moment. ** Changed in: software-properties (Ubuntu) Importance: Undecided => High ** Changed in: software-properties (Ubuntu) Status: Confirmed => Triaged ** Package changed: software-properties (Ubuntu) => ubuntu-drivers- common (Ubuntu) ** Also affects: ubuntu-drivers-common (Ubuntu Quantal) Importance: Undecided Status: New ** Also affects: ubuntu-drivers-common (Ubuntu Raring) Importance: High Status: Triaged ** Changed in: ubuntu-drivers-common (Ubuntu Quantal) Status: New => Triaged ** Changed in: ubuntu-drivers-common (Ubuntu Quantal) Importance: Undecided => High -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1053749 Title: software-properties-gtk cannot launch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-drivers-common/+bug/1053749/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs