Comment 4 for bug 1940154

The nouveau driver has never been well supported. It remains buggy for years even for old hardware so the outlook is not great there. If you would like to debug the nouveau driver then it lives in the Linux kernel at:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/nouveau

The other information I've been referring to comes from these pages:

https://www.nvidia.com/Download/index.aspx?lang=en-us
https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-340
https://launchpad.net/ubuntu/+source/linux
https://launchpad.net/ubuntu/+source/linux-hwe-5.11
https://nvidia.custhelp.com/app/answers/detail/a_id/3142/~/support-timeframes-for-unix-legacy-gpu-releases

Nvidia has never supported their own chips for more than a few years and your Samsung machine appears to be 11 years old. You would have less trouble if the machine had AMD or Intel graphics. Otherwise if you use Nvidia you will either need newer hardware or to stay on an older OS like Ubuntu 20.04.