I'm writing this using a Dell XPS 8950 with Ubuntu 22.04 (the LTS version), with NVidia drivers from the Ubuntu repository, and two monitors.  I have not done extensive testing, but the simple benchmarks glmark2 and x11perf show decent GPU usage.  So far I'm quite happy!
Currently running Ubuntu 22.10 on XPS-8500 with GeForce GTX 650 (I know... time to upgrade) Thinking about getting XPS 8950 with RTX 3060. Are there any compatibility issues with linux (Debian or Ubuntu)?  
XPS 8950 and RTX 3060