Under the Boot menu, Add New Boot Option and make your DVD drive boot option #1. Save the BIOS parameters, re-start and go back into BIOS setup. 
This is an obvious bug in the Aptio setup utility.) Then the item spontaneously became not just visible but selectable. In order to make the menu item accessible, I had to save the BIOS parameters, re-start and go back into BIOS setup. This menu option was visible but inaccessible – "greyed out" in effect, though with no visible indication.
Under the Boot menu, enable Launch CSM – if you can. 
Under the Boot menu, disable Fast Boot. Under the Security menu, disable Secure Boot Control. Reboot machine while pressing F2, to get into BIOS setup. Disable Windows Fast Startup (in Windows' Control Panel). Download Linux Mint and burn a bootable DVD. Here's what I did to replace Windows 8 (boo) with Linux Mint (yay) on a 2013 Asus ultrabook with the problematic UEFI (Unified Extensible Firmware Interface) firmware, using an external DVD drive linked to the machine with a USB cable.
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