I have recently downloaded Virtualbox 5, and I ran the .deb file I obtained from the website. I try to use MS-DOS 6.22 and it comes up with the error message.
'[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/rcvboxdrv setup' 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 even tried to run the suggested command, and it failed.