vboxclient the virtualbox kernel service is not running

[vendel]

I made a script wich worked for me (VMdebian8 jessie)
debian was missing some packages.

RUN IT IN YOUR VM !!

#!/bin/bash
# INSERT VBOXADDITIONS in your vm !!
su
apt-get update -q 
apt-get upgrade -q
apt-get install -q linux-headers-`uname -r` make gcc dkms build-essential
mkdir /tmp/vbox
mount /dev/sr0 /media/cdrom0/
cp -rvf /media/cdrom0/* /tmp/vbox
cd /tmp/vbox/
./VBoxLinuxAdditions.run
reboot

I hope it's helpful