how do I run games like counterstrike, bioshock, cod4 and others on ubuntu?

and how do I make it run in the backround (wine that is)

It's worth searching the WineHq website to see how others have tried each game but it's not unlikely that you'll find a better way to get it working for each game as they've not got a strict policy on how games get tested. Anyway here's their site
http://appdb.winehq.org/

Games tend to be made for Windows tho, although there are some great linux ones. It's often worth sorting out a dual-boot so that you can enjoy both fully
https://help.ubuntu.com/community/WindowsDualBoot

Good luck - give Wine a good bash and send in your results to them. It all helps get things working better.

Many regards from
Tom :)

If you are still having trouble with this then please post it as a new question. Only the most recent questions tend to get looked at so posting/reposting a question just before america arrives online gives the best chance of getting a good few answers.

If the problem has been resolved then please follow the link to the forum thread and mark it as Solved.

Good luck and many regards from
Tom :)

well I tried to use steam with wine, because thats what I run all my games through, but it doesn't work right.

If you are still having trouble with this then please post it as a new question. Only the most recent questions tend to get looked at so posting/reposting a question just before america arrives online after work/school gives the best chance of getting a good few answers.
https://answers.launchpad.net/ubuntu/+addquestion

If the problem has been resolved then please follow the link to the forum thread and mark it as Solved.

Good luck and many regards from
Tom :)

Counter strike source is now available as a native game through steam (also native). The native steam client requires proprietary drivers. What graphics card are you using??

If you are using an 3XXX or 4XXX series amd card you may get an error (gl_ext_texture_srgb_decode). This is due to the amd driver. updating to 13.1 driver (file on amd website, follow instructions to install--

 http://askubuntu.com/questions/124292/what-is-the-correct-way-to-install-ati-catalyst-video-drivers-fglrx

)