setup lets encrypt in Ubuntu 16.04

setupletsencrypt.sh

 ### To apply ssl certificate free via lets encrypt. ###
 Step 1
 sudo add-apt-repository ppa:certbot/certbot
 sudo apt-get update
 sudo apt-get install python-certbot-nginx
 sudo nano /etc/nginx/sites-available/default
 # change serverName yourdomainname.com
 
 sudo systemctl reload nginx
 
 sudo ufw allow 'Nginx Full'
 sudo ufw delete allow 'Nginx HTTP'
 
 sudo ufw status
 # if show inactive
 sudo ufw enable
 
 sudo certbot --nginx -d lmsindia.xyz -d www.lmsindia.xyz
 # give some question answer and then run below command to renew the ssl.
 
 sudo certbot renew --dry-run

sudo apt-get install python-certbot-nginx

please make sure by running this command because it got replace by sudo apt-get install python3-certbot-nginx

sudo ufw allow ssh

sudo ufw allow 443/tcp

After successfully installation of ssl certificate make sure to comment the #port80 line in ssl server block, which creates after the ssl