=================Failed to parse existing X config file======================
I had a problem with the nvidia-settings tool. It couldn't save to /etc/X11/xorg.conf.\\ 
Solution i found [[http://ubuntuforums.org/showpost.php?p=7273190&postcount=20|here]]:\\ 

remove any old xorg.conf / xorg.conf.backup

<code bash>
sudo rm /etc/X11/xorg.conf
sudo rm /etc/X11/xorg.conf.backup
</code>

create a new clean xorg.conf

<code bash>
gksu nvidia-xconfig
</code>

start nvida-settings a root and now you can save.

<code bash>
gksu nvidia-settings
</code>

{{tag>nvidia X11 xorg.conf}}