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VBOXVERSION=`VBoxManage --version | sed -r 's/([0-9])\.([0-9])\.([0-9]{1,2}).*/\1.\2.\3/'`
wget -q -N "http://download.virtualbox.org/virtualbox/$VBOXVERSION/Oracle_VM_VirtualBox_Extension_Pack-$VBOXVERSION.vbox-extpack"
VBoxManage extpack install --replace Oracle*.vbox-extpack