Solved by hand-editing the sources file to set it with a very minimal collection of default sources and nothing more.
-- failed to fetch hardy heron update https://bugs.launchpad.net/bugs/222196 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
