The last line in your /etc/apt/sources.list is malformed. It seems it was added by hand. You should not add a debian archive and the name of the distro is missing. Just delete the last line.
** Changed in: ubuntu Status: Incomplete => Invalid -- update-manager crashes. E: Malformed line 80 in source list /etc/apt/sources.list (dist parse), E: The list of sources could not be read. https://bugs.launchpad.net/bugs/198823 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs