Ubuntu 17.10
Changing network.target to network-online.target in /lib/systemd/system/ssh.service worked. I also added Wants=network-online.target (don't know if it's necessary but https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/ suggests it)
Ubuntu 17.10 online. target in /lib/systemd/ system/ ssh.service worked. I also added Wants=network- online. target (don't know if it's necessary but https:/ /www.freedeskto p.org/wiki/ Software/ systemd/ NetworkTarget/ suggests it)
Changing network.target to network-