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Windows 10 gives the motherboard manufacturer the option to remove the option to turn off Secure Boot manually in the BIOS.

So you may get/have a Windows 10 machine and find you cannot install a non-UEFI certified Linux distro.

http://www.pcworld.com/article/2901262/microsoft-tightens-windows-10s-secure-boot-screws-where-does-that-leave-linux.html