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This happens EVERY time I install Ubuntu. I'll pop the live CD in, and install it. The graphics work fine until I have to install mandatory updates and then restart. From there, I'll be unable to even log in, as the login screen is a glitchy mess, save for a row of pixels at the top of the screen that are actually clear.

The only way I can circumvent this is by installing a bunch of pre-release updates and switching to a proprietary driver...however Steam games, many GUI elements, and screenshots won't work, or they'll be immensely laggy and glitchy.

What can I do to ensure optimal performance and stability for an ATI Radeon HD 6850 (1GB) graphics card?

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Add detail: Ubuntu version, CPU, RAM, 32/64bit, .. –  david6 Mar 30 '13 at 21:01
    
Have you reviewed any of the ATI Radeon questions on this forum? –  david6 Mar 30 '13 at 21:02
    
ATI drivers can be found here: Try support.amd.com/en-us/download Just fill in the form information. –  vivid_vibe Dec 16 '13 at 3:53

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