Try adding UEFI support to Ubuntu!
The media creation tools only create BIOS “live” USBs. mkusb does allow UEFI bootable media but the installer makes it extremely difficult. The only reason I believe I succeeded was that I unplugged all drives except the target before booting in UEFI.
The design needs to allow the user to choose msdos BIOS media (pre-1998) or UEFI media. And the installer needs to allow the user to choose BIOS installation or UEFI installation.