It has worked! Magic! I removed dontzap and the update worked without problems. Thank you very much for your professional support!
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/776723 Title: update-manager marked Essential and cannot be removed -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
