virtualbox.org

When I try to start my guest machine, I get an error

RTR3InitEx failed with rc=-1912 (rc=-1912)
The VirtualBox kernel modules do not match this version of VirtualBox. The installation of VirtualBox was apparently not successful. Executing
'/sbin/vboxconfig'
may correct this. Make sure that you do not mix the OSE version and the PUEL version of VirtualBox.
where: supR3HardenedMainInitRuntime what: 4 VERR_VM_DRIVER_VERSION_MISMATCH (-1912) - The installed support driver doesn't match the version of the user.

I have tried the /sbin/vboxconfig, which reports successfully building and installing the vbox modules, but still no luck.

This is on an Ubuntu 16.04 system. How do I fix this?

Post the guests log file ( as an attachment ). Right click on the guest in the Main Manager then click show log. Save and post as an attachment. Compress if it is too large to post.

Somehow, I have now got it working. I tried several things, but am not sure which did the trick. It kept failing, but for a different reason. Things that I did (for others with the same issue) were:

sudo rm `find /lib/modules/4.4.0-51-generic/ -name "*vbox*" -print`
sudo /sbin//vboxconfig
sudo modprobe -r vboxpci vboxnetadp vboxnetflt vboxdrv
sudo /sbin//vboxconfig
lsmod | grep vbox

I then needed to reinstall the extension pack.

jay214128's solution worked for me! Thanks!