To completely uninstall NGINX from your system, follow the appropriate instructions based on your operating system:

For Ubuntu/Debian-based systems:

1. Stop the NGINX service:

   sudo systemctl stop nginx
   

2. Disable the NGINX service (so it doesn’t start on boot):

   sudo systemctl disable nginx
   

3. Remove NGINX and its dependencies: Run the following command to remove the NGINX package:

   sudo apt-get purge nginx nginx-common nginx-full nginx-core
   

4. Remove any unused dependencies: After removing NGINX, you can clean up any unused packages: