The following command was needed after upgrading the VirtualBox version to install the new version of the extension pack and replace the old one:
sudo VBoxManage extpack install –replace Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack
The following command was needed after upgrading the VirtualBox version to install the new version of the extension pack and replace the old one:
sudo VBoxManage extpack install –replace Oracle_VM_VirtualBox_Extension_Pack-4.2.12-84980.vbox-extpack