root@raspberrypi:~# /etc/init.d/apache2 restart
[....] Restarting apache2 (via systemctl): apache2.serviceWarning: Unit file of apache2.service changed on disk, 'systemctl daemon-reload' recommended.
Job for apache2.service failed. See 'systemctl status apache2.service' and 'journalctl -xn' for details.
 failed!