I tried to run ntopng once:
sudo /etc/init.d/ntopng start
And got the following start error:
* Missing /etc/ntopng/ntopng.start. Quitting
…fail!
ntopng was started only like this:
sudo /etc/init.d/ntopng force-start
To solve an error, just create an empty file:
sudo touch /etc/ntopng/ntopng.start sudo /etc/init.d/ntopng restart
See also:
Install and configure ntopng