Comandos:

sudo nano /etc/apt/sources.list Agregar lo siguiente:

deb http://deb.debian.org/debian bullseye main contrib non-free deb-src http://deb.debian.org/debian bullseye main contrib non-free deb http://deb.debian.org/debian-security bullseye/updates main contrib non-free deb-src http://deb.debian.org/debian-security bullseye/updates main contrib non-free deb http://deb.debian.org/debian bullseye-updates main contrib non-free deb-src http://deb.debian.org/debian bullseye-updates main contrib non-free

guardar con ctrl + o sudo apt update sudo apt install nvidia-driver