Without any commands the same. Begins scanning my drives:

Searching for Knoppix 8.1 in: /dev/"scanning my harddisks drives" and then nothing.

Same thing on my second computer with an ordinary old Bios.

For comparision another bootable USB-stick ( TAILS ) boots directly with the same boot order in Bios.

On another computer, a laptop with UEFI, Knoppix boots when secure boot is off and legacy boot enabled.