How do I know whether my BIOS is UEFI or not?

Your BIOS is either UEFI capable or it's not. If it's a relatively recent motherboard, it will have the UEFI option. Most every motherboard you come across today will have the option for UEFI boot, or legacy.

You should see this option in your BIOS somewhere. Or you could tell us what motherboard you have?
 

Rafael Mestdag

Reputable
Mar 25, 2014
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This is my motherboard:

Asus M2N68-AM