Jitsi seems to come with nginx

Hi, I’m new to Jitsi - I ran jitsi on ubuntu which let my CPUs get heavy load. Therefore, I am about to install Jitsi on debian 10.

When I try to get Letsencrypt for my domain, I get an error:

root@SERVER:~# /usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh
This script will:
- Need a working DNS record pointing to this machine(for domain my.domain)
- Download certbot-auto from https://dl.eff.org to /usr/local/sbin
- Install additional dependencies in order to request Let’s Encrypt certificate
- If running with jetty serving web content, will stop Jitsi Videobridge
- Configure and reload nginx or apache2, whichever is used

You need to agree to the ACME server's Subscriber Agreement (https://letsencrypt.org/documents/LE-SA-v1.1.1-August-1-2016.pdf) 
by providing an email address for important account notifications
Enter your email and press [ENTER]: foo@bar.acme
Saving debug log to /var/log/letsencrypt/letsencrypt.log
Plugins selected: Authenticator webroot, Installer None
Obtaining a new certificate
Performing the following challenges:
http-01 challenge for my.domain
Using the webroot path /usr/share/jitsi-meet for all unmatched domains.
Waiting for verification...
Challenge failed for domain my.domain
http-01 challenge for my.domain
Cleaning up challenges
Some challenges have failed.

- The following errors were reported by the server:

Domain: my.domain
Type:   unauthorized
Detail: Invalid response from
[123.456.789.0]: "<html>\r\n<head><title>404 Not
Found</title></head>\r\n<body bgcolor=\"white\">\r\n<center><h1>404
Not Found</h1></center>\r\n<hr><center>"

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

The problem is, I did not install nginx - I want to use Jetty. Any ideas?

This is working: https://guides.lw1.at/books/how-to-install-jitsi-meet-on-debian-or-ubuntu/page/prepare-the-lets-encrypt-certificate

When I try /usr/share/jitsi-meet/scripts/install-letsencrypt-cert.sh after the installation, it fails.

The following led me to success:

Certificate and chain:
Key file: