It’s not related to secure boot (I have that disabled) it’s related to nouveu drivers not supporting the 4090 (yet)

Well… Say that to my live USB I tried booting off of a machine with a very modern nVidia card. I had to create a new boot entry to disable nouveau and install nVidia proprietary graphics into a persistent partition.

I understand nVidia is shit, and doesn’t play nice with others. But my point is - it’s not always that easy. (I thought it would be! I lost many hours, and pulled out lots of hair!)