kazulog@sv1:~$ sudo systemctl disable nginx
Synchronizing state of nginx.service with SysV service script with /usr/lib/systemd/systemd-sysv-install.
Executing: /usr/lib/systemd/systemd-sysv-install disable nginx
Removed '/etc/systemd/system/multi-user.target.wants/nginx.service'.
kazulog@sv1:~$ systemctl is-enabled nginx
disabled
kazulog@sv1:~$ systemctl is-active nginx
active
kazulog@sv1:~$ sudo reboot