I am following along to your youtbe guide on installing a kuberentes cluster. I get to the apt update command after running the echo deb line command and I get an error message:
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.
I am not sure why this wouold be and wonderef whether the link in your show notes may have changed at source?
Any ideas would be appreciated.......