EDIT My computer is Thinkpad E420 with Intel HD3000 and ATI 6630m.
I have reinstalled my Ubuntu12.04.3 yesterday. I had successfully installed Ubuntu and ATI Catalyst Video driver many times about half year ago following these links:
How do I get AMD/Intel Hybrid Graphics drivers to work?
What is the correct way to install ATI Catalyst Video Drivers (fglrx)?
However, this time I have no luck with installing ATI Catalyst Video driver.
I have tried version 13.4, 13.1, 12.8 of ATI Catalyst Video driver.
It seemed that 13.4 doesn't support 12.04 any more, following this link , the lowest Ubuntu version supported by ATI 13.4 is 12.10 and for the reset of the ATI drivers, the kernel version and xorg version of Ubuntu 12.04.3 is too high to be supported.
So, should I stay on ubuntu 12.04.1 with ATI 12.8, or there is any way to install ATI driver on Ubuntu 12.04.3?