*** This bug is a duplicate of bug 948053 ***
    https://bugs.launchpad.net/bugs/948053

nvidia-173 drivers are not compatible with Xorg (ABI to be precise) version 
released in 12.04. 
So I stick with 11.10 version of Xorg. I had to make the following changes to 
backport Xorg:

In /etc/apt/sources.list :

deb http://fr.archive.ubuntu.com/ubuntu/ oneiric main
deb-src http://fr.archive.ubuntu.com/ubuntu/ oneiric main

In /etc/apt/preferences:

Package: xserver-xorg*
Pin: release a=oneiric
Pin-Priority: 1050

Note related to nvidia-173 on Ubuntu 12.04:
I'm using old hardware with nvidia-173 drivers and I don't like the fact 
"composite" is mandatory to use Unity correctly (very laggy) I had to force 
composite to switch it "off" to avoid laggy windows by modifying 
/etc/X11/xorg.conf:

Section "Extensions"
    Option             "Composite" "Disable"
EndSection

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https://bugs.launchpad.net/bugs/922268

Title:
  nvidia-173 does not support video driver ABI in precise

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