No public key for https://download.jitsi.org during install

When going through the steps to install Jitsi on Ubuntu 18.04 I receive an error after adding the repository https://download.jitsi.org stable/.
“The repository ‘https://download.jitsi.org stable/ InRelease’ is not signed.
Updating from such a repository can’t be done securely, and is therefore disabled by default.”

Can anyone point me in the right direction to fix this problem?

This is how to fix it https://github.com/jitsi/jitsi-meet/blob/master/doc/quick-install.md#add-the-repository
Execute the two commands one by one.

Thanks. I found my mistake. I was not putting sudo on my apt-key command. All is well now!

It has the same problem
root@Jitsi:~# curl https://download.jitsi.org/jitsi-key.gpg.key | sudo sh -c ‘gpg --dearmor > /usr/share/keyrings/jitsi-keyring.gpg’
-bash: curl: command not found
sudo: unable to resolve host labprueba.online: No address associated with hostname
gpg: no valid OpenPGP data found.

It is working now. We will be doing some changes to minimize these kind of problems in the future.