Comment 2 for bug 1804478

The systemd bug #3752 was fixed by commit 444b01704648c2f1292531f17c3b8c95bf1a9896 (networkd: configure link even if no routes have been received by dhcp (#6886)] which should be included in Ubuntu 18.04 systemd 237:

$ git tag --contains 444b01704648c2f1292531f17c3b8c95bf1a9896
v236
v237
v238
v239