this problem affected me in ubuntu beta1 10.04
i installed 9.04 and upgraded using update-manager -d
installed virtualbox and now it show this error..
NS_ERROR_FAILURE (0x80004005)
Componente: Console
Interfaccia: IConsole {6375231a-c17c-464b-92cb-ae9e128d71c3}
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VirtualBox can't operate in VMX root mode.
https://bugs.launchpad.net/bugs/292588
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