Re: insmod: error inserting './usr/src/nv/nvidia.ko and can't find my NVIDIA card?
It's not just debian. Nouveau is part of the vanilla kernel now, probably enabled as a module by default. Since Ubuntu already forces a reboot when activating proprietary drivers, it will probably just blacklist the nouveau driver as part of the driver manager utility users can use to enable the nvidia driver (assuming it doesn't already). I'm not sure what other distributions will/are doing.