i've Asus Laptop A43SM the specifications can be seen here. I am trying to install Ubuntu 12.04 LTS on my laptop, but something wrong is happening. When I boot up Ubuntu on this laptop the first screen Ubuntu loader shows up, but then it freezes; I can't do anything but push the power button. I've tried to use a usb drive and a CD but that doesn't help. Anyone can tell me how to install Ubuntu ?