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Hello,
In order for you to get a Let’s Encrypt SSL certificate you need to first own the domain name in question and second point the domain name A record to your server’s IP address.
As you are running this locally, you would either need to add a port mapping to your router so that you could use your home network public IP for your A record.
I would personally do one of these two things here:
https://www.digitalocean.com/community/tutorials/how-to-install-bigbluebutton-on-ubuntu-16-04
Hope that this helps!
Best,
Bobby