When I type the above command I get: VBoxClient error: unrecognized option -display When I type VBoxClient -help there is no option -display shown. VirtualBox additions installed along with X and whatever else required. If it turns out to be more complicated than this, then you are beyond my expertise and should consult the VirtualBox online documentation. Windows 10 host, VirtualBox 6.1.18 & FreeBSD 12.2 guest. You may have to touch the keypad’s right CTRL button in order to release the cursor and go to the top menu to hit the Devices button to insert the Guest Additions CD, or to hit the Run button. Once you have done that, in the virtual machine’s file manager locate the Guest Additions CD image in the CD drive, then run Setup or, you may just see this screenshot, attached, when you Insert Guest additions CD Image if so, just hit the Run button, and you don’t need to try to find the correct file on the CD Image to actually run the guest additions.

Once the Extension Pack is added into the VirtualBox manager, start up your virtual machine and then you can add it to the virtual machine: Devices > Insert Guest Additions CD Image …. The Extension Pack includes the Guest Additions. On this page,, you can download the current version for your host and also the correct Extension Pack.

You should download the Extension Pack from Oracle for the version of VirtualBox you are using. If the Extension Pack is not listed there, it needs to be added. Then go to FIle > Preferences > Extensions. Did you first install the guest additions in VirtualBox itself, before trying to install it in the virtual machine? You do that in the Oracle VM VirtualBox Manager screen, that is what starts up when you run VirtualBox.

Virtualbox guest additions windows 10