I am having trouble installing Ubuntu 14.04 on a Samsung N10 netbook running Windows XP. I have followed the Ubuntu instructions and created a bootable USB stick but the N10 manual says it is set to boot from an external CD drive. If I try with the USB stick, it ignores it and boots to Windows. If I press F12 during startup for a short time, it boots to Windows; if I hold F12 down I get an error message. I don't have an external CD drive. Is there any other way I can install Ubuntu on the computer?