I downloaded the Kubuntu 12.04 iso straight from the website. Using Universal USB Installer, which I have used before so I know that it works, I put the Iso onto a USB. My computer has no OS on it (due to a mix-up I deleted Windows). I boot from the USB and it goes straight to a Black screen with just a flashing "_" (without the quotations) at teh top left and nothing else happens. It just stays like that.