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我有一块Nvidia Ge force Ge6150 SE显卡。我正在运行 ubuntu 12.04。当我尝试安装 .run 文件时，它失败了。它显示这样的消息：

我在卸载旧驱动程序后尝试安装它。仍然是相同的消息。这是日志文件：

nvidia-installer log file '/var/log/nvidia-installer.log'
creation time: Mon Jun 11 05:46:17 2012
installer version: 295.53

PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games

nvidia-installer command line:
    ./nvidia-installer

Using: nvidia-installer ncurses user interface
-> The file '/tmp/.X0-lock' exists and appears to contain the process ID '1062' 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 …

如何卸载手动安装的 Nvidia 驱动程序 310.14 并恢复到 Noveau。我有 Ubuntu 12.10。