ricky@ricky:~$ nvidia-xconfig --busid=PCI:3:0:0 --sli=AA

WARNING: Unable to locate/open X configuration file.

Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found

ERROR: Unable to write to directory '/etc/X11'.

ricky@ricky:~$ sudo nvidia-xconfig --busid=PCI:3:0:0 --sli=AA
[sudo] password for ricky:

WARNING: Unable to locate/open X configuration file.

Package xorg-server was not found in the pkg-config search path.
Perhaps you should add the directory containing `xorg-server.pc'
to the PKG_CONFIG_PATH environment variable
No package 'xorg-server' found
New X configuration file written to '/etc/X11/xorg.conf'

ricky@ricky:~$