Here is a comprehensive tutorial on upgrading to Sun's Virtualbox. which compliles correctly during install.

VirtualBox

• is Open Source
  
• Uses USB better easeier and without limitations
• Allows you to convert existing Vmware virtual machines to VBox.

https://wiki.ubuntu.com/UbuntuMagazine/HowTo/Switching_From_VMWare_To_VirtualBox:_.vmdk_To_.vdi_Using_Qemu_+_VdiTool