Complied a Nginx server to the latest version and also add Brotli support, but get the following error message:
$ sudo service nginx status
Loaded: masked (/dev/null; bad)
Active: inactive (dead)
$ sudo service nginx restart
Failed to restart nginx.service: Unit nginx.service is masked.
To fix the problem, or error, just unmask with the command:
$ sudo systemctl unmask nginx.service