According to the release notes none of the latest available NVidia drivers (520, 525) are supporting RTX 4080 devices.
Moreover, driver 520 is broken and fails on boot, apparently a long known, unfixed bug, and driver 525 is not present in NVidias developer deb repository. So even if I’d like to give those a shot, I’m not able to.
I just got a 4080 and plopped it into my Ubuntu server only to discover this exact issue. I imagine they will have drivers out soon but some kind of official date would be nice