CUDA driver version is insufficient for CUDA runtime version Ubuntu 14.04.3 GTX 970 CUDA 7.5

CUDA_driver_version_is_insufficient_for_CUDA_runtime_version.txt

Symptom:
  Error message "CUDA driver version is insufficient for CUDA runtime version" shown when running
    /usr/local/cuda-7.5/samples/1_Utilities/deviceQuery/deviceQuery

My Equipment:
  Ubunt 14.04.3 Trusty
  EVGA GTX 970
  CUDA 7.5

Cause: 
  The driver version is "not matched" with the SDK header and library version.
  My driver is "352.63" but SDK is "352.39".
  You have to install the driver bundled with the CUDA ".run" file. 

1. Download "cuda_7.5.18_linux.run" from https://developer.nvidia.com/cuda-downloads
2. $ bash cuda_7.5.18_linux.run -extract /home/miki/Downloads/cuda_7.5/
3. you will see 3 files. One file is driver
  -rwxr-xr-x 1 root root 1024788904 Jan 24 15:32 cuda-linux64-rel-7.5.18-19867135.run*
  -rwxr-xr-x 1 root root   96490585 Jan 24 15:32 cuda-samples-linux-7.5.18-19867135.run*
  -rwxr-xr-x 1 root root   77715105 Jan 24 15:32 NVIDIA-Linux-x86_64-352.39.run*

4. reinstall NVIDIA-Linux-x86_64-352.39.run
4.1. Alt-F1 go to CLI, sudo service lightdm stop; sudo init 3; sudo ./NVIDIA-Linux-x86_64-352.39.run

5. Now recompile /usr/local/cuda-7.5/samples/1_Utilities/deviceQuery/Makefile
  In my case "driver version is insufficient" error message won't shown again.