Comment 5 for bug 539997

Some tweaks and comments:

first i've uninstalled some packages: plymouth-x11, most of themes, nouveau and nvidia-current, then reboot.

Of course booting fail to command line, no surprise indeed. Then
- sudo dpkg-reconfigure udev
- sudo jockey-text -l : found nvidia_173 & nvidia_current
 first surprise: packages names are with an other typo: nvidia-173 & nvidia-current, could it be source of troubles (jockey using its own typo, confusing), and nvidia_195 not found

- sudo jockey-text -e xorg:nvidia_currrent : return activated but not in use

- sudo dpkg-reconfigure nvidia-current :
      return : removing all dkms modules done
                 dpkg-trigger: might be called from maintenance script or with << --by-package >>
                 loading new nvidia-current-195.36.15 dkms files...
                 building only for 2.6.32-18-generic-pae , building for architecture i686
                 building initial module for 2.6.32-18-generic-pae done
           nvidia-current.ko : running module version sanity check.
           - no original module exists within this kernel
           - installing to /lib/modules/2.6.32-18-generic-pae/updates/dkms/
           depmod ....
      dkms: install completed

Rebooting and checking hardware drivers: still activated but not in use
Trying sudo jockey-text -e xorg:nvidia-current : return unknown driver