CheckMK 1.6 on Rock PI 4 under Debian buster

As it says: “… depends on XXX” → you need to install package XXX

But “apt-get -f install” should fix that automatically for you by pulling in all the missing dependencies, provided your APT sources are working. Plain Debian 10 Buster from the official repositories, right?

Perhaps you need to run “apt update” first.
And try “apt install /path/to/cmk-package.deb” instead of “dpkg -i …”