i need to know what kind of sound card driver and where to find it.
In order to help, we need to know what sound card ( chip set ) you have. Please open a konsole and run the command 'sudo lspci' and post the results. That will list the devices on your pci bus.
It is possible the driver is already loaded. Open a konsole and run 'sudo lsmod |grep snd' and post the results. All commands without quotes. If you get some output for the last command, then open a mixer, make sure your sound is not muted, and the volume is turned up. Then try to play a sound file.
Ubuntu comes with a lot of drivers for common sound cards. Odds are you all ready have the driver.