Sound Troubleshooting

1. Double click on the "speaker" icon in the upper right hand corner of the Desktop. Make sure that the speaker, headphone and master sliders are not muted, and have the volume up from zero.

Gnome Volume Control application can also be launched by using Alt+ F2 and type

gnome-volume-control

Re-check the sliders.

2. try to run

aplay /usr/share/sounds/alsa/Front_Center.wav

in a terminal. You should hear a voice saying "Front" then "Center". If it doesn't play the first time you run that command, try running it again (it may not play the first time); you can also try running

aplay /usr/share/sounds/alsa/Front_Left.wav aplay /usr/share/sounds/alsa/Front_Right.wav

3.Is the system recognizing your sound card?

Open a terminal window, and type

sudo aplay -l

Your output should look something like this:

**** List of PLAYBACK Hardware Devices ****
card 0: Intel [HDA Intel], device 0: ALC861VD Analog [ALC861VD Analog]
Subdevices: 0/1
Subdevice #0: subdevice #0

If you see aplay: device_list:221: no soundcard found..., Ubuntu is not recognizing your sound card for playback. Check that you have the proper modules installed.
4.Do you have the sound modules installed?

Open a terminal window, and type

find /lib/modules/`uname -r` | grep snd

You should see a whole list of items come up. If you don't, it means that the upgrade process missed installing the kernel modules for sound.

for more info please visit reference site :


https://help.ubuntu.com/community/SoundTroubleshooting