[ubuntu] Stuck at login screen

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http://ubuntuforums.org – I just attempted to install amd drivers for my video card and for some reason when I put my password into the login screen the screen blocks, shows a few messages (which are attached) and go back to theologian screen. I know that I a entering my password correctly, some don't know what is going on. Someone please help ,e with this. Attached Images image.jpg (166.9 KB) (Hardware)