VirtualBox kernel modules do not match this version error (RTR3InitEx failed with rc=-1912 (rc=-1912) )

I have successfully fixed the issue in my Ubuntu 16.04.1 LTS
Check the package
dpkg -l | grep -i virtualbox

Uninstall from system
sudo apt-get remove unity-scope-virtualbox
sudo apt-get update && sudo apt-get remove --purge virtualbox-5.1

wget -q https://www.virtualbox.org/download/..._vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -

Finally install it:

sudo apt-get update
sudo apt-get install virtualbox-5.1


This fixed the issue for me