Ubuntu 12.04 - Instalación del controlador Nvidia Geforce 210 - "Error" en ejecución del xserver

Ubuntu 12.04 - Instalación del controlador Nvidia Geforce 210 - "Error" en ejecución del xserver

He estado intentando actualizar mi controlador Nvidia, pero sigo recibiendo errores. Como soy bastante nuevo en Ubuntu.

El siguiente es el registro de instalación:

Using: nvidia-installer ncurses user interface
-> The file '/tmp/.X0-lock' exists and appears to contain the process ID '1196' of a runnning X server.
ERROR: You appear to be running an X server; please exit X before installing.  For further details, 
please see the section INSTALLING THE NVIDIA DRIVER in the README available on the Linux driver download page at www.nvidia.com.
ERROR: Installation has failed.  Please see the file '/var/log/nvidia-installer.log' for details.  
You may find suggestions on fixing installation problems in the README available on the Linux driver download page at www.nvidia.com.

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