I installed Ubuntu alongside Windows 8.1 over an usb drive on my laptop. At first I had problems with the boot selection menu and I fixed it with EasyBCD. Now when I boot up my laptop it takes me to chose Windows 8.1 or Ubuntu. I press Ubuntu and it takes me to the grub menu. Now I chose there ubuntu 12.04 and it starts to boot for few seconds and then my screen goes black and nothing happens. A few seconds later I hear like short error noise and still nothing happens.