How to install letsencrypt ssl certificate on nginx without Unable to locate package letsencrypt error

Today, I thought of moving some of the websites to ssl. so I looked up for a guide on Google and most of them says

sudo apt-get install letsencrypt


but it ends with

E: Unable to locate package letsencrypt

So, I had to go back to the original repo to fix this problem.


git clone https://github.com/letsencrypt/letsencrypt
cd letsencrypt
./letsencrypt-auto --help

this will show the help. If you are trying to configure to run on nginx.

 sudo ./letsencrypt-auto --nginx

and then select the website number. Make sure you do not have anything running on port 443 now.