Problem Installing ATI graphics/proprietary drivers

[cartman2790]

So I just installed Ubuntu a few days ago, and I downloaded the drivers for my graphics card (ATI Radeon 4890) and installed them via the terminal. However when I restarted my computer I realized that my x.conf file had no resolutions under the "Modes" section. Because of this, the GUI wasn't starting. So this was fixed easily enough but now I cant enable desktop graphics or advance desktop graphics. Furthermore, when I try to install/enable the proprietary ATI graphics drivers vis system->administrator->hardware drivers, it gives my an install error. Finally if I try to update my drivers via system update, it tells me that I have a broken package and therefore, it can't install.

I'm pretty new to linux, can anyone help me out?

[devils casper]

Hi and Welcome !

You have to fix broken package problem first.

Execute this in Terminal

sudo apt-get clean all
sudo apt-get update
sudo apt-get install htop

Post exact error message here, if any.

** I am suggesting htop installation to check broken package problem only. htop is an interactive process viewer.