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I have laptop with 2 HDD (Toshiba P870) and Windows 8 preinstalled on the first drive. Secure boot is enabled. When I install Linux (Ubuntu 12.04.2) on second drive it can't boot because of authentication problem. if I disable secure boot in bios - will I still be able to boot Windows 8?

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Why don't you try it? If anything goes wrong, you should be able to enable it back. –  mvp May 14 '13 at 8:14

2 Answers 2

Yes, Windows 8 will still boot. I also did this on my Dell Inspiron 15R SE.

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Windows 8 boots normally no matter you disable or enable the Secure Boot option. It only fails to boot after changing the BIOS mode from UEFI to Legacy (without CSM support).

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