I have a problem with Ubuntu 14.04 installation.
I boot up the disc, it loads, then it takes me to a white empty screen and gets stuck for a while. After that terminal opens telling that my GPU has locked up. I am aware I could resolve this by installing video drivers, but hey, I haven't even installed my Ubuntu :(
I am pretty sure it's because of my GPU (an old Nvidia 9500GT), but I'm still saving up for a new one.
I have faced a problem when installing Ubuntu 12.04 on this particular machine. It used to get stuck at some point also, but it once did not and I don't know why. I happilly installed my Pangolin back then after that lucky case.