Most Linux users don't normally use any out of tree drivers. https://help.ubuntu.com/community/VirtualBox/Installation https://help.ubuntu.com/community/Virtual

Most Linux users don't normally use any out of tree drivers. https://help.ubuntu.com/community/VirtualBox/Installation https://help.ubuntu.com/community/VirtualBox/Installation indicates that Virtualbox is shipping via DKMS, which is infrastructure for automatically rebuilding the Virtualbox code every time the kernel is updated.