I'm trying to dual boot my new laptop, downloaded the latest version of Ubuntu 64 bit, burnt it to a DVD, it boots as it's supposed to on my brother's laptop, not on mine, I did everything I could, modified the boot configuration using easyBCD, still doesn't boot into Ubuntu, from the boot menu I only see windows 7, when I installed Linux mint 2 days ago it booted correctly, had to remove it because I faced installation errors and switched to Ubuntu to try it, it just doesn't boot no matter what. how can U fix this? U don't see no errors and I have pressed all the f? buttons, I just see windows.