Step-by-step – GeForce GTX 1660 Ti Debian Bullseye Driver Installation

Installing

2. 2. Enabling Non-free Repo

   How to Add Debian Non Free Repo Preserving System

   Step by step Guide

   Link to Step by step Debian Non Free Repository Setup Guide

3. 3. Installing

   Then to Install GTX 1660 Ti Driver on Debian
   Simply run:

   sudo apt install nvidia-driver nvidia-settings

   If Got “User is Not in Sudoers file” then see: How to Enable sudo
   And Possibly to Configure the X Server after Setup run:

   nvidia-xconfig

   Last, to Load your barely New Graphics Driver Reboot with:

   sudo reboot