If you're using Oneiric, the only thing you need to do is remove the
nvidia_173 or nvidia_173_updates driver.

The command "jockey-text -l" will give you what supplementary drivers are 
installed, which you can remove with e.g. :
jockey-text -d xorg:nvidia_173

Remove all activated, xorg-prefixed drivers and the system should fall back to 
nouveau. IMHO nouveau is the best you can get if you don't have a proprietary 
driver supporting your GPU. If you're a perfectionist, you can even purge the 
remnants of the nvidia drivers, get a list with :
dpkg -l 'nvidia*'

You will notice some packages have the status flags "rc" which means
they're removed/scheduled for removal ("r"), and configuration files
remain ("c"). Then do an "apt-get purge" followed by the names of those
nvidia "rc" packages separated by spaces... But don't remove nvidia-
common !

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https://bugs.launchpad.net/bugs/873929

Title:
  X freezes after login on iMac8.1 after upgrade to oneiric

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