Press Win+R key and when the run box pops up type in : MSInfo32Hit Enter key and wait for system information to display, check the bios mode as in the picture below :
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Open terminal and type : dmesg | grep "EFI v"Hit enter and if you get results something like this :
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If you see any results, Then you have an EFI enabled pc.
If no results are returned your PC is booted in Legacy Mode.
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