$ apt-cache policy nvidia-glx-new
nvidia-glx-new:
  Installed: 169.09+2.6.24.9-10.27
  Candidate: 169.09+2.6.24.9-10.27
  Version table:
 *** 169.09+2.6.24.9-10.27 0
        500 http://uk.archive.ubuntu.com hardy/restricted Packages
        100 /var/lib/dpkg/status

$ nvidia-settings
The program 'nvidia-settings' can be found in the following packages:
 * nvidia-glx
 * nvidia-settings
 * nvidia-glx-new
Try: sudo apt-get install <selected package>
bash: nvidia-settings: command not found