What do I do with this unwillingness of the system to install from this ppa?
E: The repository 'http://ppa.launchpad.net/smcnam/rbpitch-release/ubuntu focal Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
https, it’s complaining that someone could launch a MitM attack against you with that repo line.
That could just change the error message.
Certificate provided is for wrong domain (and URL gives 404 if domain is changed to be the domain on the cert, and if you ignore the cert error then it seems to get a 404 on the original domain anyway).
At this stage I would be querying it with the operator of the repository.
that’s what i’ll do