Penumbra: Overture 1.1 Black screen

[hero1900]

hi when i launch the game i will end up with a black screen with nothing until i kill the process
here is what i get when i start the game. owh by the way i use ubuntu 11.04 have nvidia 8400 GS graphic card but i dont think its the issue its related to libraries thing

Code: (Select All)

/home/nadeem/Downloads/desura/common/penumbra-overture/penumbra.bin: /usr/lib/libCgGL.so: no version information available (required by /home/nadeem/Downloads/desura/common/penumbra-overture/penumbra.bin)
/home/nadeem/Downloads/desura/common/penumbra-overture/penumbra.bin: /usr/lib/libCg.so: no version information available (required by /home/nadeem/Downloads/desura/common/penumbra-overture/penumbra.bin)