How to Fix Ubuntu Linux Sound Problems

Have the sound worked before? If it have, you certainly should reinstall your OS
What's the version of your Ubuntu?
The newest is 12.04 Precise Pangolin.
It has the drivers for the most of sound cards
I hope I was helpful
Corsair
1. Have your sound worked before in any other platform like windows?
If yes,
2. Make sure the volume level in "Sound settings" is turned up and is not mute.
3. Then, we need to make sure whether or not Ubuntu is recognizing your sound card. For this, go to terminal and type
sudo aplay -lÂ
The output should be something like this
**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDAÂ Intel], device 0:Â ALC861VDÂ Analog [ALC861VDÂ Analog]
  Subdevices: 0/1
  Subdevice #0: subdevice #0
If the output is like this
aplay: device_list:221: no soundcard found.Â
This means that the sound modules have not been installed correctly. In this case, you need to re-install Ubuntu.
Hope this helped in resolving your problem.
Cheers!