nvidia-installer log file '/var/log/nvidia-installer.log'
creation time: Fri Apr  1 17:11:17 2016
installer version: 361.28

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

nvidia-installer command line:
    ./nvidia-installer
    --glvnd-glx-client

Using: nvidia-installer ncurses user interface
-> Detected 12 CPUs online; setting concurrency level to 12.
-> The file '/tmp/.X0-lock' exists and appears to contain the process ID '2043' of a runnning X server.
ERROR: You appear to be running an X server; please exit X before installing.  For further details, please see the section INSTALLING THE NVIDIA DRIVER in the README available on the Linux driver download page at www.nvidia.com.
ERROR: Installation has failed.  Please see the file '/var/log/nvidia-installer.log' for details.  You may find suggestions on fixing installation problems in the README available on the Linux driver download page at www.nvidia.com.