Just upgraded my server from 16.04 to 18.04 and I also came across this error.
Managed to carry on by doing /usr/share/dbus-1/system- services/org.freedesktop.systemd1.service /usr/share/dbus-1/system- services/org.freedesktop.systemd1.service.bak -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1773859 Title: upgrades to 18.04 fail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1773859/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs