The release upgrader includes its own version of apt_clone.py and so the raring upgrader, used to upgrade from quantal to raring includes this fix.
If you download the release upgrader from here: http://archive.ubuntu.com/ubuntu/dists/raring/main/dist-upgrader- all/current/raring.tar.gz you can examine the tarball and the source for apt_clone.py to confirm this. Having said that when you ran the release upgrade and updater version of apt_clone.py was not included in the upgrader, but it is now so I am setting this to Fix Released. ** Changed in: ubuntu-release-upgrader (Ubuntu) Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1077113 Title: do-release-upgrade crashes if any directories exist in /etc/apt/sources.list.d To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt-clone/+bug/1077113/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs