Well, it's very annoying, I have looking every where for a solution to get Virtualbox Windows 7 VM working on Xubuntu Kernel 4.4.0-143-generic , BUT NOWAY
it not works !!! My solution was change the default kernel boot to 4.4.0-141-generic and it works fine. Of course it's a BUG, the kernel 4.4.0-143-generic can't find vboxdrv, when try to run
modprobe vboxdrv
it gives an error that the drive is missing, vboxusers is set correctly, the virtualbox KEYS are assigned correctly, I tried VB 5.138 which uses dkms then remove and purge it and install from Oracle webpage VB 6.04 which not uses dkms. So it's very frustrating. So, any comments that can help me run VB on -143-generic kernel ? thanks, Vladi
Attached image of VB log file under kernel -143
sudo modprobe vboxdrv
show?