[Ubuntu] solve 11.04 Realtek High Definition Audio no work

1.Open up terminal. Applications -> Accessories -> Terminal

2.Type (or copy/paste) this:

sudo apt-get install asoundconf-gtk alsa-oss libasound2
libasound2-plugins padevchooser gstreamer0.10-pulseaudio
ubuntu-restricted-extras

3. Press Enter。

Reference：

• How to Get Your HD Audio to Work with Ubuntu 9.04