Maybe this is the same:
Bug #87986: [Xubuntu Feisty] nvidia-glx from the repository doesn't work https://launchpad.net/ubuntu/+source/linux-restricted-modules-2.6.20/+bug/87986
Maybe this is the same:
Bug #87986: /launchpad. net/ubuntu/ +source/ linux-restricte d-modules- 2.6.20/ +bug/87986
[Xubuntu Feisty] nvidia-glx from the repository doesn't work
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