Hello,
I did a USB bootable from "ubuntu 14.04.1 AMD64 gnuradio 3.7.6.5 live DVD" with a persistence file.
As I boot with a EFI file from my HP pavillion15 AMD64 it gives me the possibility to install Ubuntu and to try it as well!
I have not yet installed it because the distro does't work whenever I open any window: any window of every program I run is made of "stripes" only and it is not clear at all!
Instead when I boot from dvd live it works very well!
I haven't yet found a solution