if the installation process broken with error "kernel module compiled failed", try to upgrade the gcc compiler to 4.9

https://devtalk.nvidia.com/default/topic/902950/-solved-faulty-340-9x-drivers-with-kernels-4-2-x-and-4-3-x/

p.p1 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Helvetica; color: #323333; -webkit-text-stroke: #323333}
p.p2 {margin: 0.0px 0.0px 0.0px 0.0px; font: 14.0px Helvetica; color: #323333; -webkit-text-stroke: #323333; min-height: 17.0px}
span.s1 {font-kerning: none; background-color: #dedede}
span.s2 {font-kerning: none}

sudo su -

add-apt-repository ppa:sergey-dryabzhinsky/toolchain

apt-get update

apt-get install gcc-4.9 g++-4.9 cpp-4.9

cd /usr/bin

rm gcc g++ cpp

ln -s gcc-4.9 gcc

ln -s g++-4.9 g++

ln -s cpp-4.9 cpp

and verified with

gcc --version