nvidia驱动安装失败

我的显卡是nvidiaGF5200,系统是ubuntu6.10,安装完显卡驱动，执行命令glxinfo | grep direct检查是否安装正确时，总是显示：
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Error: couldn't find RGB GLX visual
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
我已经试过n次了都没成功，快要崩溃了，有没有那位大侠救救命啊！