I've upgraded my Ubuntu 10.04 64 bit to 12.04.1. When I restart the laptop and select Ubuntu (I have Windows 7 also); the screen becomes black. I enter the password and login to Ubuntu and I still don't see anything .
My notebook is Acer 5736Z. processor: dual core Pentium T4500. Graphics card: Intel Express (GMA 4500M). 3GB RAM
Thank you for help