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3 of 3 Added paragraph about checking /sys/firmware/efi

If you've booted using the UEFI firmware as opposed to using BIOS firmware then your system should make the EFI NVRAM variables available in:




When booting using a BIOS (or the BIOS emulation mode of UEFI firmware) then these variables aren't available.

In fact, as @Santropedro pointed out, the path


is missing when booting using a BIOS, which is easier to check.