I own a Acer Aspire 5552 laptop, which has Ubuntu on it. And now i updated it to 12.04 LTS from 11.10. When i turn the laptop on, it says : Your system is running in low-graphics mode, Your screen, graphics card, and input device settings could not be detected correctly. You will need to configure these yourself.
I read about this on Ask Ubuntu already, and it suggested to got to Ctrl + Alt + F1 and reinstall my desktop, or install fglrx. Well, these things what I read on this site : http://askubuntu.com/questions/12545...0-graphics-car

Both of them don't work. And if I don't enter Terminal and just click OK (press Enter, because the mouse cursor isn't there) when it says you system is running in low-..., I get options, but i can't choose any of them, can't even click cancel or OK. My graphics card is ATI Mobility Radeon HD 4250. Help please! Thanks