Install NVIDIA driver

sudo add-apt-repository ppa:graphics-drivers/ppa   
sudo apt-get update   
sudo apt-get upgrade

Driver version 340 is for GeForce 7xxx through 8xxx GPUs, version 367 is for Kepler-, Maxwell- and newer GPUs.

apt-get install nvidia-340
reboot

cat /proc/driver/nvidia/version

NVRM version: NVIDIA UNIX x86_64 Kernel Module  340.101  Thu Dec  1 15:52:31 PST 2016
GCC version:  gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.4) 

lspci -k | grep -A2 VGA

01:00.0 VGA compatible controller: NVIDIA Corporation G80 [GeForce 8800 GTX] (rev a2)
    Subsystem: eVga.com. Corp. G80 [GeForce 8800 GTX]
    Kernel driver in use: nvidia

hwinfo --framebuffer

02: None 00.0: 11001 VESA Framebuffer
  [Created at bios.459]
  Unique ID: rdCR.EFc6IEIuFVE
  Hardware Class: framebuffer
  Model: "NVIDIA G80 Board - p355h00"
  Vendor: "NVIDIA Corporation"
  Device: "G80 Board - p355h00"
  SubVendor: "NVIDIA"
  SubDevice: 
  Revision: "Chip Rev"
  Memory Size: 14 MB
  Memory Range: 0xe1000000-0xe1dfffff (rw)
  Mode 0x0300: 640x400 (+640), 8 bits
  Mode 0x0301: 640x480 (+640), 8 bits
  Mode 0x0303: 800x600 (+800), 8 bits
  Mode 0x0305: 1024x768 (+1024), 8 bits
  Mode 0x030e: 320x200 (+640), 16 bits
  Mode 0x030f: 320x200 (+1280), 24 bits
  Mode 0x0311: 640x480 (+1280), 16 bits
  Mode 0x0312: 640x480 (+2560), 24 bits
  Mode 0x0314: 800x600 (+1600), 16 bits
  Mode 0x0315: 800x600 (+3200), 24 bits
  Mode 0x0317: 1024x768 (+2048), 16 bits
  Mode 0x0318: 1024x768 (+4096), 24 bits
  Mode 0x0330: 320x200 (+320), 8 bits
  Mode 0x0331: 320x400 (+320), 8 bits
  Mode 0x0332: 320x400 (+640), 16 bits
  Mode 0x0333: 320x400 (+1280), 24 bits
  Mode 0x0334: 320x240 (+320), 8 bits
  Mode 0x0335: 320x240 (+640), 16 bits
  Mode 0x0336: 320x240 (+1280), 24 bits
  Mode 0x033d: 640x400 (+1280), 16 bits
  Mode 0x033e: 640x400 (+2560), 24 bits
  Config Status: cfg=new, avail=yes, need=no, active=unknown

glxinfo | grep OpenGL

OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce 8800 GTX/PCIe/SSE2
OpenGL core profile version string: 3.3.0 NVIDIA 340.101
OpenGL core profile shading language version string: 3.30 NVIDIA via Cg compiler
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.3.0 NVIDIA 340.101
OpenGL shading language version string: 3.30 NVIDIA via Cg compiler
OpenGL context flags: (none)
OpenGL profile mask: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 2.0 NVIDIA 340.101 340.101
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.00
OpenGL ES profile extensions: