Ubuntu Dual GPU system CUDA installation

Hi everyone,

I am trying to install cuda devdriver_4.0_linux_3.2_270_41.19 to my Ubuntu 11.04 PC. I have 2 GTX560.

However i always came across some errors.I attached the related log file /var/log/Xorg.0.log. the error is :

[  7001.510] (EE) NVIDIA(GPU-1): Failed to initialize the NVIDIA graphics device!

[  7001.510] 


[  7001.510] 0: X (xorg_backtrace+0x3b) [0x80eab8b]

[  7001.510] 1: X (0x8048000+0x5fb38) [0x80a7b38]

[  7001.510] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0x6d740c]

[  7001.510] Segmentation fault at address (nil)

[  7001.510] 

Caught signal 11 (Segmentation fault). Server aborting

[  7001.510] 

Please consult the The X.Org Foundation support 

         at http://wiki.x.org

I searched the web but there is no proper installation for such configuration.

I will be appreciated your helps.
Xorg.0.txt (9.16 KB)