Comment # 5 on bug 1208941 from Larry Rainey

Do you have the extension pack installed?

It has to be installed without virtualbox running or funny things happen.

here is my script to install the extension pack.

echo update VirtualBox
VBOX_VERSION=`/usr/bin/VBoxManage --version | awk -F_ {'print $1'} | awk -Fr
{'print $1'}`
VBOX_EXT_VERSION=$VBOX_VERSION
# echo Virtualbox version installed is $VBOX_VERSION and $VBOX_EXT_VERSION
VBOX_EXT=`echo
Oracle_VM_VirtualBox_Extension_Pack-${VBOX_EXT_VERSION}.vbox-extpack`
# echo File is $VBOX_EXT
cd /tmp
/usr/bin/wget http://download.virtualbox.org/virtualbox/$VBOX_VERSION/$VBOX_EXT
echo y | /usr/bin/VBoxManage extpack install --replace $VBOX_EXT
rm -f $VBOX_EXT