Dear Maintainer, apt-key del <keyid> accepts anything as keyid and prints "OK" even if nothing happened. Perhaps I should have known better, but I initially used `apt-key del 4096R/`` and got an "OK" and thought everything was good. Of course, an `apt-key list` then showed that the key was still there. I finally figured out that I had to use `apt-key del 65FFB764`. Some suggestions: 1. warn the user if the provided parameter is something that can never be a keyid 2. count from how many keyrings the key was removed and print that, instead of simply printing an "OK"