Left 4 Dead 2 Beta

Left 4 Dead 2 Beta

Trouble launching L4D2 with ubuntu 12.04

When I run the game, I have the error message :
"Required OpenGL extension "GL_Ext_Texture_sRGB_decode" is not supported. Please update your openGL driver".

I added PPA repository to update the drivers but it did not fix the problem.

Could you please help ?

Thanks in advance.
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Try http://steamcommunity.com/app/223530/discussions/0/810925580027991811/

If it does not work... what graphics card do you have?
Viimeisin muokkaaja on felixmole; 4.12.2013 kello 12.37
Julien 14.12.2013 kello 6.21 
Hi, thanks for your reply.
Actually, your solution does not work.
My graphic card is a ATI Radeon HD 4870.
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