Nginx - не запускается с ошибкой Failed to restart nginx.service: Unit nginx.service is masked. - Debian 8

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Nginx - не запускается с ошибкой Failed to restart nginx.service: Unit nginx.service is masked. - Debian 8

Ошибка при запуске nginx на Debian 8:

# systemctl restart nginx
Failed to restart nginx.service: Unit nginx.service is masked.
# systemctl status nginx
● nginx.service
  Loaded: masked (/dev/null)

Решение:

# systemctl unmask nginx.service
#  systemctl restart nginx
#  systemctl enable nginx

Что такое mask/unmask?

systemctl unmask, systemctl mask - запрещает(позволяет) любые попытки запуска юнита, а также автозагрузку при старте ОС.