[solved]It does not start

[zergling]

Hi, when I try to lunch the game with ./penumbra I get this message

Penumbra exited unexpectedly, please check
/home/zergling/.frictionalgames/Penumbra Overture/Episode1/hpl.log
for any error messages
Also try running
ulimit -c unlimited
And re-running Penumbra and try and recreate the error
then submit the generated core file or stack trace
zergling@zergling-laptop:~/PenumbraEp1$

I have tried to look at the log file and I got this :

-------- THE HPL ENGINE LOG ------------

Creating Engine Modules
--------------------------------------------------------
Creating graphics module
Creating system module
Creating resource module
Creating input module
Creating sound module
Creating physics module
Creating ai module
Creating scene module
--------------------------------------------------------

Initializing Resources Module
--------------------------------------------------------
Creating resource managers
Misc Creation
--------------------------------------------------------

Initializing Graphics Module
--------------------------------------------------------
Init low level graphics
Setting video mode: 800 x 600 - 32 bpp
ERROR: Could not set display mode setting a lower one!
FATAL ERROR: Unable to initialize display!
Deleting ATI shader to 0

I have a laptop everex xt5000t and I have installed my video driver with automatix. I am using Ubuntu 7.04.
My video board is a Nvidia GeForce Go 7600

Bye