Zend certified PHP/Magento developer

Rhino Linux — how to get virtualbox-dkms to compile?

Rhino Linux (rolling Ubuntu) is using the 6.5 kernel, but stable Ubuntu is not up to there yet. I assume that is why I am getting error messages from VirtualBox. It says I don’t have virtualbox-dkms installed, but I do.
What is the solution?
I installed virtualbox and virtualbox-dkms from the Rhino repo.