I have recently installed Ubuntu 12.04 LTS, and while experimenting with the software, I have encountered this problem:
I learnt that ctrl + alt + F1~F6 can bring me to the terminal (Or was it a virtual terminal? I am not entirely sure on that). Either way, the terminal works, but the real problem starts when I try to exit the terminal with alt + F7 to get back to my GUI. The screen starts flashing in black and white, where I could only force reboot with the power button.
Generally I can still access the GUI by restarting, but the bug happens when I switch between the GUI and the terminal.
I also notice that returning from suspend also results in the same error.
I am completely new to Linux, especially to its command line, I would appreciate that you would keep the answers plain and easy.