Windows 8 machines with UEFI bios will ONLY Boot Windows 8 64 bit OR Ubuntu.
Unless secure boot can be turned off and Legacy CSM GPT boot turned on it will not.
1. Boot Dos
2. Boot earlier versions of windows including 7 or Vista or XP.
3. Boot any OS that has not paid the Fee to Microsoft for a Certificate. Canonical Paid for the windows 8 Certificate to be in Ubuntu 12.04.3 and later versions.
When a UEFI Secure Boot system boots up Ubuntu, it will first boot a loader image. Canonical will be relying on a Microsoft key for booting this loader image from its CDs and will be signing the loader only with that key due to UEFI restrictions.
Other linux installs that rely on GPLv3 GRUB 2 boot loader will not load nor will MSDOS, IBM DOS, FREEDOS, WIN9X ETC.
This booting lockout also includes floppy disks and Usb flash drives.
http://ozlabs.org/docs/uefi-secure-boot-impact-on-linux.pdf
Secure boot technology is now part of the new UEFI firmware specification. It is a given that Microsoft®’s Windows 8 and beyond will require secure boot to be enabled by default. UEFI secure boot is a technology integrated into the latest version (v2.3.1) of the UEFI specification. When UEFI Bios is at the 3.0 level computers will ONLY be able to boot secure boot and Windows only or Ubuntu since they paid for a Microsoft Windows 8 bootloader. CSM Legacy booting will be Gone at that time.
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