I am not able to play "Half-Life-2" on Steam + Ubuntu 14.04 .
Error shown in message box on screen:

    Could not find required OpenGL entry pint 'glGetError'! Either your video card is unsupported, or your OpenGL driver needs to be updated.

I have a Dell Inspiron Laptop.
My OS is Ubuntu 14.04 and my graphics card is AMD Radeon HD 8600M.
I have installed AMD properietry Driver.

The partial output of "glxinfo" is as follows:

    name of display: :0

    libGL: screen 0 does not appear to be DRI3 capable

    libGL: pci id for fd 4: 8086:0a16, driver i965

    libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/i965_dri.so

    libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/i965_dri.so

    libGL: Can't open configuration file /home/arushi/.drirc: No such file or directory.

    libGL error: failed to load driver: i965

    libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/tls/swrast_dri.so

    libGL: OpenDriver: trying /usr/lib/i386-linux-gnu/dri/swrast_dri.so

    libGL: driver does not expose __driDriverGetExtensions_swrast(): /usr/lib/i386- linux-gnu/dri/swrast_dri.so: undefined symbol: __driDriverGetExtensions_swrast

    libGL: Can't open configuration file /home/arushi/.drirc: No such file or directory.

    libGL: Can't open configuration file /home/arushi/.drirc: No such file or directory.

    libGL error: failed to load driver: swrast

    display: :0  screen: 0

    direct rendering: No (If you want to find out why, try setting LIBGL_DEBUG=verbose)