Seems to have occurred as early as ubiquity 2.12.5 and apt-clone version 0.2.3~ubuntu2 see further bug 1065154.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1119621 Title: KeyError: "filename './etc/apt/sources.list' not found" during precise desktop installation on a system that already had precise installed. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1119621/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs