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https://linuxconfig.org/nvidia-geforce-driver-installation-on-debian-jessie-linux-8-64bit
NVIDIA GeForce Driver Installation on Debian Jessie Linux 8 64bit The easiest way to install NVIDIA GeForce Driver on Debian Linux 8 ( Jessie ) is to use official contrib and non-free debian repository. First add the following non-free and contrib repositories to your /etc/apt/sources.list. Therefore, first change the content of your /etc/apt/sources.list file to include contrib and non-free packages eg.:
deb http://ftp.au.debian.org/debian/ jessie main contrib non-free deb-src http://ftp.au.debian.org/debian/ jessie main contrib non-free
Next, update your repositories:
# apt-get update
At this point the nvidia-driver package becomes available for the installation:
# apt-get install nvidia-driver nvidia-current: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.16.0-4-amd64/updates/dkms/
nvidia-uvm.ko: Running module version sanity check. - Original module - No original module exists within this kernel - Installation - Installing to /lib/modules/3.16.0-4-amd64/updates/dkms/
depmod.... DKMS: install completed. Setting up nvidia-settings (340.46-2) ... Setting up libegl1-nvidia:amd64 (340.65-2) ... Setting up xserver-xorg-video-nvidia (340.65-2) ... Setting up nvidia-driver (340.65-2) ... Processing triggers for libc-bin (2.19-13) ... Processing triggers for initramfs-tools (0.116) ...
During the installation you will see a notification about conflicting version of the free software nouveau nvidia driver with your currently being installed non-free nvidia kernel module which you can simply ignore.
Conflicting nouveau kernel module loaded
The free nouveau kernel module is currently loaded and conflicts with the non-free nvidia kernel module.
The easiest way to fix this is to reboot the machine once the installation has finished.
Wait for the installation to finish and once done generate a new /etc/X11/xorg.conf xorg configuration file with nvidia-xconfig command. First, install nvidia-xconfig package:
# apt-get install nvidia-xconfig
After the installation is finished execute nvidia-xconfig command to generate new /etc/X11/xorg.conf config file:
# nvidia-xconfig New X configuration file written to '/etc/X11/xorg.conf
If the above command shows message about the lack of a previous /etc/X11/xorg.conf config file simply disregard it and reboot your system to load a newly installed nvidia driver. After the reboot, login to your desktop and start the official nvidia-settings configuration tool either from command line:
$ nvidia-settings