I recommend saving the state or shutting down any virtual machines that are running.
Next, find out the name of any existing extension packs:
vboxmanage list ext packs
Extension Packs: 1
Pack no. 0: Oracle VM VirtualBox Extension Pack
Version: 4.3.6
Revision: 91406
Edition:
Description: USB 2.0 Host Controller, Host Webcam, VirtualBox RDP, PXE ROM with E1000 support.
VRDE Module: VBoxVRDP
Usable: true
Why unusable:
Now remove your existing version by substituting the name (bolded above) of your existing version into this command:
sudo vboxmanage extpack uninstall "Oracle VM VirtualBox Extension Pack"
0%…10%…20%…30%…40%…50%…60%…70%…80%…90%…100%
Successfully uninstalled “Oracle VM VirtualBox Extension Pack”.
Next, download the version that matches your Virtualbox version and then install it with the following command, substituting in the name of your downloaded file:
sudo vboxmanage extpack install \ Oracle_VM_VirtualBox_Extension_Pack-4.3.8-92456.vbox-extpack
0%…10%…20%…30%…40%…50%…60%…70%…80%…90%…100%
Successfully installed “Oracle VM VirtualBox Extension Pack”.