this never happened before, it's also not happening ion my backup computer (same OS, xubuntu 24.04).
Message: get more security updates through ubuntu pro with esm-apps enabled, learn more about ubuntu pro <url here>
How do I get rid of it.
Ubuntu never advertised itself so blatantly.
Unfortunately, the required steps to rid your Ubuntu (non-pro) system from this and other forms of advertisements are a lot more involved than it has any right to be.
Or, perhaps, consider another distro.