installation step by step:

1. First you should have graphic acceleration for your driver, I have G-force so I'm using  NVIDIA-Linux-x86-177.80-pkg1 driver from http://www.nvidia.com/object/linux_display_ia32_180.44.html to install it:
   
   • log in to one of the system terminals Ctrl + alt + F1 (F2 is OK to).
   • run the flowing code
     

     code

     sudo apt-get install build-essential
     sudo /etc/init.d/gdm stop
     sudo sh NVIDIA-Linux-x86-177.80-pkg1.run
     sudo /etc/init.d/gdm start
     
     
     
     
2. installed wine automatically using WineHQ repositories   
3. Download and install a DirectX DLL using th flowing script:
   

   code

   wget http://www.m3fe.com/files/d3dx9_34.zip
unzip d3dx9_34.zip -d ~/.wine/drive_c/windows/system32/
   
   
4. Change Wine to use Windows XP emulation mode, and ddd “d3dx9_34.dll” into the winecfg Library section as a Native dll
   

   code

   winecfg
   
   
   
   On the Application tab, change the Windows Version to Windows XP
   
   
   Now goto the Library tab, type in d3dx9_34.dll and press the Add button.
   
5. now install the COD4
6. run COD4 (iw3sp.exe)
   
7. OK wine is not perfect so: turn off the following options for optimal performance in options > graphics
   
   • Anti-aliasing
   • Sync Every Frame
   • Shadows
   • Specular Map
   • Depth of Field
   • Glow
   • Number of Dynamic Lights
   • Soften Smoke Edges (most impotent)
     
   

   
   
   
   
8. Enjoy playing