With Ubuntu/Debian, by default, root login over ssh is disabled. Root login would only be possible via console.

To access root via SSH, you would need to install the OS with a regular user account (you can set these details at provisioning). Once installed, you can login as the normal user and then su - root.

If you would like to enable root login via SSH, you will need to modify the config file at /etc/ssh/sshd_config

Do we accept XYZ?