I reinstalled Ubuntu 12.04 on my laptop because the Unity desktop was freezing.

Reinstalling 12.04 seems to have fixed the freezing problem, but now the audio does not work. When I go to Settings > Audio, under the Output tab it only has the option for Digital Output. There is no option for Analog Output.

The sound card shows up under lspci as:

00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 02)

What would be the command to reinstall the audio subsystem? If that would fix it...