For installing SSL certificate for Nginx in Ubuntu you need to have two files: SSL crt file and SSL private key file and then put inside the server section in nginx.conf like the example below:
sudo vim /etc/nginx/nginx.conf
server {
listen 443 ssl;
ssl_certificate /PATH_TO_SSL_CRT_FILE.crt;
ssl_certificate_key /PATH_TO_SSL_PRIVATE.key;
server_tokens off;
root /var/www;
server_name www.yourdomain.com;
client_max_body_size 1G;
}
Then you need to restart nginx:
sudo service nginx restart