sudo apt update sudo apt install nginx
$ sudo systemctl status nginx ● nginx.service - A high performance web server and a reverse proxy server Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: enabled) Active: active (running) since Wed 2019-12-04 11:53:18 UTC; 13s ago Docs: man:nginx(8)

参考
How to Install Nginx Web Server on Ubuntu 18.04