Did you go through the steps required for Secure Boot?
Could be needed up dependencies in the apt repo. I’ve been this many times, in many distros, over the years.
In any case, I recommend getting the latest driver directly from Nvidia. It’s easier to keep it outside the apt ecosystem than to wrestle with overriding outdated dependencies. Plus you get the newer driver, and honestly, Nvidia’s installer is easier than Debian’s (particularly if you have Secure Boot enabled).