Found a fix for my problem and it now working.

Overview of my problem:
Ubuntu 12.10 + NVIDIA GeForce 9300 GS
Unity do not start Ubuntu 12.10 + Compiz (opengl) - Fatal: 
glXQueryExtensionsString is NULL for screen 0

What I did to solve this issue:
re-installed the nvidia drivers following this tutorial: 
http://www.dedoimedo.com/computers/ubuntu-quetzal-nvidia.html

   sudo apt-get install build-essential linux-source
   uname-r
   sudo apt-get install linux-headers-`uname -r`
   sudo apt-get install nvidia-current
   sudo /sbin/lsmod | grep nvidia 
no nvidia found, so:
   sudo depmod -a
   sudo modprobe nvidia_current
   sudo /sbin/lsmod | grep nvidia
now it is ok, with count 0
   sudo /etc/init.d/lightdm restart

unity is restored! yay!

Hope this helps someone.

J

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to fglrx-installer in Ubuntu.
https://bugs.launchpad.net/bugs/1054257

Title:
  [fglrx] Compiz (opengl) - Fatal: glXQueryExtensionsString is NULL for
  screen 0

Status in Compiz:
  Incomplete
Status in “compiz” package in Ubuntu:
  Incomplete
Status in “fglrx-installer” package in Ubuntu:
  Incomplete

Bug description:
  I have upgrade to Ubuntu 12.10 from Precise.
  Unity do not start.
  If i try to start from terminal i see this

  http://pastebin.com/nXUY8E4m

  I have proposed active
  More info:
  Compiz: 0.9.8.2+bzr3377-0ubuntu1
  Unity: 6.6.0-0ubuntu1
  Catalyst: 12.9

To manage notifications about this bug go to:
https://bugs.launchpad.net/compiz/+bug/1054257/+subscriptions

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