Wrestling with Windows 8, Secure Boot, and UEFI to Boot USB Flash Drive
All I wanted to do is to install Ubuntu Linux and Mac OS X alongside Windows 8 on my new Asus G46VW-BSI5N06 gaming ultrabook laptop after Shrinking Windows 8 Partition. Ok. That's a tall order, but it's definitely possible with a PC computer; at least with Windows 7 and prior operating systems. Anyway, I found that it's not all that easy with Windows 8, Secure Boot, and UEFI.
First, I launched BIOS, by pressing the F2 key on boot. Then I attempted to change the boot priority to the Ubuntu 12.10 on a flash drive ("UEFI: Generic-SD/MMC 1.00"), rather than the Windows 8 hard drive ("Windows Boot Manager (P1: ST750LM022 HN-M750MBB)"). But that didn't work, it still booted into Windows 8.
Then I disabled the Windows 8 hard drive all together. That caused the Asus G46VW to boot into BIOS automatically.
Next, I used the "Boot Override" functionality to select "UEFI: Generic-SD/MMC 1.00". That didn't work either. It booted into Windows 8 once again.
I enabled "Launch CSM" under the "Boot" menu. It popped a dialog box that says, "CSM will not be enabled if Secure Boot Control is enabled. Please disable Secure Boot Control first, reboot and try again." I made sure that "Secure Boot Control" is disabled. The boot priority now shows "Generic-SD/MMC 1.00". Windows 8 hard drive is still disabled.
That finally booted up Ubuntu 12.10 on the USB drive. I then installed Ubuntu 12.10 alongside Windows 8. So far, I haven't been able to boot the installed Ubuntu 12.10. But that's story for another thread.
Ok. I had a fallacy. In my haste to dual boot this new Windows 8 computer, I had used an existing Ubuntu 12.10 Desktop (32-bit) installation that I used on my old netbook. I forgotten to download the 64-bit version that is compatible with UEFI. That's the sole reason why I could only get it to boot in legacy mode (Launch CSM).
To get Ubuntu 12.10 Desktop (64-bit) to boot off the USB is rather easy. Simply insert the USB drive into the USB port, disable "Secure Boot Control" in the BIOS. After saving your change and restarting the computer, press ESC key repeatly until the boot selection screen pops up. Select "UEFI: Generic-SD/MMC 1.00" and get into GNU GRUB on the USB drive.
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