How To Solved 403 Permission Denied Nginx.  Nginx By default set user www-data, Maybe it's not the right permission for you. Basically, this problem we face when we are working with Django.

Open the terminal and type ...

sudo nano /etc/nginx/nginx.conf 

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

Now Replace it with your username

user ubuntu;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}