Install WebRTC

At first, be sure that you have enabled WebRTC in your web browser.

about:config

media.peerconnection.enabled = true

Update the system and install packages

apt-add-repository ppa:strukturag/spreed-webrtc
apt-get update && apt-get install spreed-webrtc

systemctl status spreed-webrtc

active (running)

spreed-webrtc-server -v

Version 0.28.1

Add webrtc to services

vi /etc/services

webrtc          8080/tcp                        # nextcloud

netstat -apt | grep webrtc

tcp   0   0 localhost:webrtc    *:*    LISTEN    13197/spreed-webrtc