Is it possible to download Ubuntu 15.04 directly from the main site to my laptop as a clean install to rid issues "PCC Probe failed" with Ubuntu 15.04 running now? I'd like to know why it is so difficult to install or overwrite and clean install Ubuntu 15.04 from the Ubuntu website? Why must "we" go the roundabout method of getting a USB stick formatted, then the OS downloaded to the stick beforehand? Why the hassle over Open Source? Having "hurtles" is not going to convince a skeptical public full of Windows and Apple users to consider Linux if installation more like "skinning the cat." Why not offer preformatted USB sticks that will overwrite if necessary and perform "Clean Installs?