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adr41n@localhost[~]:$ sudo nextcloud.enable-https lets-encrypt
In order for Let's Encrypt to verify that you actually own the
domain(s) for which you're requesting a certificate, there are a
number of requirements of which you need to be aware:

1. In order to register with the Let's Encrypt ACME server, you must
   agree to the currently-in-effect Subscriber Agreement located
   here:

       https://letsencrypt.org/repository/

   By continuing to use this tool you agree to these terms. Please
   cancel now if otherwise.

2. You must have the domain name(s) for which you want certificates
   pointing at the external IP address of this machine.

3. Both ports 80 and 443 on the external IP address of this machine
   must point to this machine (e.g. port forwarding might need to be
   setup on your router).

Have you met these requirements? (y/n) y
Please enter an email address (for urgent notices or key recovery): [email protected]
Please enter your domain name(s) (space-separated): koolapps.com
Attempting to obtain certificates... error running certbot:

Saving debug log to /var/snap/nextcloud/current/certs/certbot/logs/letsencrypt.log
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for koolapps.com
Using the webroot path /var/snap/nextcloud/current/certs/certbot for all domains.
Waiting for verification...
Cleaning up challenges
Failed authorization procedure. koolapps.com (http-01): urn:acme:error:unauthorized :: The client lacks sufficient authorization :: Invalid response from http://koolapps.com/.well-known/acme-challenge/FNL_XC5N2zmnrYh4tvHGUtmc6L4U-mJjIautl3HsBJg: "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<html><head>
<title>404 Not Found</title>
</head><body>
<h1>Not Found</h1>
<p"
IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: koolapps.com
   Type:   unauthorized
   Detail: Invalid response from
   http://koolapps.com/.well-known/acme-challenge/FNL_XC5N2zmnrYh4tvHGUtmc6L4U-mJjIautl3HsBJg:
   "<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
   <html><head>
   <title>404 Not Found</title>
   </head><body>
   <h1>Not Found</h1>
   <p"

   To fix these errors, please make sure that your domain name was
   entered correctly and the DNS A record(s) for that domain
   contain(s) the right IP address.