Wubi on Windows 8 without secure boot?

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http://askubuntu.com – I have a MacBook Pro. I've heard rumours that if Windows 8 is going to have this thing called "Secure boot", Wubi cannot work. At first I plan to install Ubuntu on my mac via Wubi(and windows via bootcamp), but since I can't find my Windows 7 Installation CD, I installed Windows 8 on my Mac and installed Ubuntu on a VM. Then suddenly Windows 8 Release Preview was released today so I decided to install over my existing copy of Windows 8 Consumer Preview. When I went to the Windows 8 Upgrade assistant, it said that the firmware on my Mac doesn't support Secure booting. I don't even know (HowTos)