henkstubbe

Mmm, no sound. Fixed it with this way:

Type this into a shell

$ alsamixer

You will now see what appears to be a graphical equalizer. It is more like ten different volume controls in the sample place.

To navigate around:

• Left and Right Arrow Keys – Move left and right (if you move long enough in one direction you will get back to where you started – you will not fall off the screen )
• Up and Down Arrow Keys – Increase and decrease volume respectively.
• Letter M Key – Mutes/unmutes. If a channel is unmuted, then there is a green box underneath the volume slider. If the channel is muted, the box is grey.

Saving Sound Settings

Do this step to ensure that your alsamixer settings are reloaded with each boot. First make sure you have your settings just the way you like them in alsamixer. Then do sudo alsactl store 0 or if this is your nth sound card (where n is the number of soundcards in your computer) replace 0 with n-1. Many thanks to xpix for trying this out.

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