vboxvfs: unrecognized service vboxadd-timesync: unrecognized service ./vboxadd: 469: ./vboxadd: /sbin/rcvboxadd-x11: not found /opt/VBoxGuestAdditions-5.1.6/init/vboxadd: 469: /opt/VBoxGuestAdditions-5.1.6/init/vboxadd: /sbin/rcvboxadd-x11: not found /opt/VBoxGuestAdditions-5.1.6/init/vboxadd: 331: /opt/VBoxGuestAdditions-5.1.6/init/vboxadd: cannot create /etc/depmod.d/vboxvideo-upstream.conf: Directory nonexistent