This guide will show you how to compile and install the legacy Nvidia driver on Debian. The steps bellow are compatible with both nvidia-legacy-340xx-driver and nvidia-legacy-390xx-driver and can be installed on Debian 13 (Trixie) as well as Debian 12 (Bookworm) or Debian 11 (Bullseye) in both 64-bit and 32-bit version. Execute the lines one by one and wait for every line to finish before proceeding to next. Only the lines starting with sudo should be executed as root. The lines with sudo pbuilder will take a lot of time.
To install the nvidia-legacy-390xx-driver version replace 340xx with 390xx everywhere bellow.
To install both 64-bit and 32-bit libraries for wine/steam you should run Step 2. twice.
Update, upgrade and install the required packages.
If you use 32-bit system do not install linux-headers-amd64.