root@localhost ~certbot certonly --nginx -d localhost.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Could not choose appropriate plugin: The requested nginx plugin does not appear to be installed 
The requested nginx plugin does not appear to be installed

root@localhost ~
# certbot certonly --nginx -d localhost.com
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator nginx, Installer nginx
Starting new HTTPS connection (1): acme-v02.api.letsencrypt.org
Requesting a certificate for localhost.com
Performing the following challenges:
http-01 challenge for localhost.com
Waiting for verification...
Cleaning up challenges

IMPORTANT NOTES:
 - Congratulations! Your certificate and chain have been saved at:
   /etc/letsencrypt/live/localhost.com/fullchain.pem
   Your key file has been saved at:
   /etc/letsencrypt/live/localhost.com/privkey.pem
   Your certificate will expire on 2021-09-07. To obtain a new or
   tweaked version of this certificate in the future, simply run
   certbot again. To non-interactively renew *all* of your
   certificates, run "certbot renew"
 - If you like Certbot, please consider supporting our work by:

   Donating to ISRG / Let's Encrypt:   https://letsencrypt.org/donate
   Donating to EFF:                    https://eff.org/donate-le