Hi. Iv'e installed kali linux on a 8 GB usb flash drive (i also have a 1.5 TB external drive for file storage) and when i set the system to boot from the USB drive in the BIOS it will give a "invalid boot signature" or a similar error. For reference the system i am testing it on is a Samsung series 7 chronos laptop, i have also tested it on a cheaper asus laptop. (not sure which model) I was able to get it to successfully boot on 3 desktops (2 prebuilt and 1 custom built) but for some reason it won't boot on any of the laptops. When i tried disabling all the security settings in the BIOS and nothing happened. Any ideas on how to fix this?