Jitsi-meet and Jitsi-meet-prosody doesn't install on Ubuntu 18.04

After strictly following the install guide https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md by adding all repositories and running sudo apt-get -y install jitsi-meet, it begins the installation and breaks it with:

…
Setting up lua-expat:amd64 (1.3.0-4) ...
Setting up lua-event:amd64 (0.4.3-2build1) ...
Setting up jicofo (1.0-549-1) ...
Setting up prosody (0.10.0-1build1) ...
Setting up jitsi-meet-prosody (1.0.4025-1) ...
The given hostname does not exist in the config
The given hostname does not exist in the config
dpkg: error processing package jitsi-meet-prosody (--configure):
 installed jitsi-meet-prosody package post-installation script subprocess returned error exit status 1
dpkg: dependency problems prevent configuration of jitsi-meet:
 jitsi-meet depends on jitsi-meet-prosody (= 1.0.4025-1); however:
  Package jitsi-meet-prosody is not configured yet.

dpkg: error processing package jitsi-meet (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates it's a follow-up error from a previous failure.
                            Processing triggers for systemd (237-3ubuntu10.39) ...
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Errors were encountered while processing:
 jitsi-meet-prosody
 jitsi-meet
E: Sub-process /usr/bin/dpkg returned an error code (1)

What hostname did you add when you were asked for such?

I’m having the exact same issue! I used an internal FQDN…