(...)
Setting up samba (2:4.5.8+dfsg-0ubuntu0.17.04.2) ...
Failed to preset unit: Unit file /etc/systemd/system/samba-ad-dc.service is masked.
/usr/bin/deb-systemd-helper: error: systemctl preset failed on samba-ad-dc.service: No such file or directory
Processing triggers for libc-bin (2.24-9ubuntu2) ...

root@zesty-samba-server-1677329:~# echo $?
0