I messed up the audio on my 10.10 installation. I had a problem of having no sound when plugging in the headphones and following many different solutions for that problem I (de)installed several packages. Now I have no sound at all.
I don't want a solution on how to fix my headphone problem. I just want to reset all audio-related setting and packages to the after-installation state (where at least the speakers were working).
I found several places where it is said that there is no global reset-to-after-installation possibility. Or that on could use
apt-get clean, but even if this would remove all non-standard audio-packages, I don't know which packages I would have to install in order to get the standard audio-packages.