Hello Linux Geeksters.
In this article I will give you a temporary fix for the no sound problem, after upgrading from Ubuntu 12.10 Quantal Quetzal to Ubuntu 13.04 Raring Ringtail.
It should be a better solution, but this is what I have done for fixing my sound on Ubuntu 13.04:
Reinstalling alsa-base and pulseaudio
Remove alsa-base and pulseaudio:
$ sudo apt-get remove --purge alsa-base pulseaudio indicator-sound
Reinstall alsa-base and pulseaudio:
$ sudo apt-get install alsa-base pulseaudio indicator-sound
Force them to load:
$ sudo alsa force-reload