I installed Ubuntu 12.04 64x with Live USB as my CD ROM isn't working. The Live USB was made in Windows (no errors came while doing so). I then installed the 12.04 from USB with everything OK. In the end it asked for reboot I did that and removed USB too. Upon reboot my system hangs on black screen with only a black '_' blinking.
But when I put USB back in and then reboot, username / password login screen does come up but as soon as I login the whole system becomes unstable and I can't even see the Unity Launcher. I can create a folder but then it says some
missing libs and whole system goes hung.