On a fresh install of karmic, using an Nvidia 7800 GT. When I went to click on my username to log in, some artifacts would appear on the screen, then the system would freeze. hard. Couldnt even ctrl+alt to another console. Installing the Nvidia drivers fixed the issue. To fix it:

  1. Do a hard reset on the machine
  2. When you arrive at the GDM screen, DO NOT CLICK ON ANYTHING.
  3. press CTRL + ALT + F5. Your screen will switch over to a text console.
  4. Log in.
  5. Install the Nvidia glx driver

    sudo aptitude install nvidia-glx-new
  6. Reboot the machine.

    sudo reboot


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