On Wed, 2021-02-03 at 11:25 +0100, Carlos E. R. wrote:
This is probably off-topic, but I have evidence that my machine has
hacked. When trying to access
CUPS I get a message that says in effect that it is a security
does not complete.
This is a wild guess, but maybe you're accessing CUPS through the browser, using TLS, and the certificate is self-signed. Browsers would show that security dialog, but it does not mean that you've been hacked.