boot order

Hi all, I have a Dell Latitude E7450 and I'm attempting to boot Knoppix 8.1 from an external USB drive. I went to Setup and "Boot Sequence" but "USB Storage device" is was not listed. I clicked on "Add Boot Option" and typed in "USB Storage device" as a boot option and prioritized it at the top...

Hello. I am a first time linux user trying to get xubuntu going. I downloaded the .iso file and put it on my flash drive using rufus, so I know that part is good to go. However, when I get to my BIOS screen and set the boot order to boot from usb first, it just keeps opening windows 10 no...