sudo /etc/init.d/apache2 restart
[sudo] password di pettinati: 
/etc/init.d/apache2: 46: .: Can't open /etc/apache2/envvars
[....] Restarting apache2 (via systemctl): apache2.serviceJob for apache2.service failed because the control process exited with error code.
See "systemctl status apache2.service" and "journalctl -xe" for details.
 failed!