I took my 2GB USB, deleted everything on it, ran Universal USB Installer pendrivelinux), selected Ubuntu, my iso location, USB Drive(F), and checked “format drive(to be sure everything is erased). Everything is good.

Next, without touching my USB(I know it works/plugged-in because I just used universal installer on it), I restarted my PC and selected F10.

Here you see my BIOS, without an option to boot from USB.