After deleting the lock file, I was able to complete the update with apt-get.
-- Message "daemon died" appeared while running update-manager https://bugs.launchpad.net/bugs/443344 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
