SSL Certificate

[Dickson-25]

**hello world
**Am using this command from 233blog
sudo certbot certonly --standalone --preferred-challenges http --agree-tos --email your-email-address -d test.example.com........after i edit & fill the command i run on error ..Hint(The Certificate Authority failed to download the challenge files from the
temporary standalone webserver started by Certbot on port 80. Ensure that the listed domains point to this machine and that it can accept inbound connections from the internet.)..am usin ubuntu 20TLS ..cant get ssl after running command above...any help OS android user.