Hi Filipe,
the bbb-install.sh script does not install a Stun/Turn Server. This script tells BBB to USE a stun/turn server, one that you have available or perhaps one you have configured yourself.
Try the Trickle ICE page (
https://webrtc.github.io/samples/src/content/peerconnection/trickle-ice/). Here you can really test a stun/turn server. Again, you have to have one available.
My guess is that the bbb-install.sh script is waiting for port 443 to be "free", which means it's being blocked by a firewall. And this has nothing to do with a stun/turn server. This is most likely the certbot program trying to get a certificate for you BBB server.
Could you pleas paste your complete bbb-install.sh command? We may be able to help you further.
One last thing: when the bbb-install.sh script is finished, you see a message like "possible problems". THIS means your BBB is ready.
Regards,
J.