@Orca My experience: BIOS allows both legacy boot and UEFI. BIOS instructions (incorrectly) state that legacy boot must be turned on to boot from USB. When legacy boot is on the USB stick is shown under both legacy and UEFI sections. The latter, for me, was less apparent so I chose the first option by mistake. Anyway, this is why the first option for folks switching to Linux should be to buy a PC with it preinstalled. Installing an OS will always be an enthusiasts game.