apt update
apt install mumble-server
dpkg-reconfigure mumble-server
nano /etc/mumble-server.ini

mumble-server.ini

database=/var/lib/mumble-server/mumble-server.sqlite
logfile=/var/log/mumble-server/mumble-server.log
pidfile=/var/run/mumble-server/mumble-server.pid
welcometext="<br />Welcome to this server running <b>Murmur</b>.<br />Enjoy your stay!<br /><a href='https://www.meinekleinefarm.net/'>MeineKleineFarm.net</a>"
port=***
serverpassword=***
bandwidth=108000
users=16
channelnestinglimit=3
bonjour=False
sslCert=/etc/letsencrypt/live/meinekleinefarm.net/fullchain.pem
sslKey=/etc/letsencrypt/live/meinekleinefarm.net/privkey.pem
uname=mumble-server
sendversion=True

service mumble-server restart