I've the same problem. I'm operating 17.10 systems with network initially configured with DHCP. We need to add pemanent static routes and networkd failed with the same error than reported here.
I think I've found the upstream bug in systemd : https://github.com/systemd/systemd/issues/1850 ** Bug watch added: github.com/systemd/systemd/issues #1850 https://github.com/systemd/systemd/issues/1850 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1781652 Title: should be possible to specify static routes on a dhcp-configured interface To manage notifications about this bug go to: https://bugs.launchpad.net/netplan/+bug/1781652/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
