原来的地址是不对的：
http://dlc.sun.com.edgesuite.net/virtualbox/4.0.14_OSE/VBoxGuestAdditions_4.0.14_OSE.iso
对的地址：
http://dlc.sun.com.edgesuite.net/virtualbox/4.0.14/VBoxGuestAdditions_4.0.14.iso
# cp VBoxGuestAdditions_4.0.14.iso /usr/local/share/virtualbox-ose/VBoxGuestAdditions.iso