Before upgrading to the new VirtualBox 5 port, check UPDATING and back
up existing VMs.
Attempting to run an old VM without unloading the old VirtualBox kernel
module (vboxdrv) and loading the new version produces this error:
RTR3InitEx failed with rc=-1912(rc=-1912)
where: supR3HardenedMainInitRuntime what: 4
VERR_VM_DRIVER_VERSION_MISMATCH (-1912) - The installed
support driver doesn't match the version of the user.
'kldunload vboxdrv && kldload vboxdrv' *should* work, but the error
might prevent that and require a reboot to load the new version.
After getting the new kernel module loaded, update the Guest Additions
in the VMs.
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