Sound card was not detected for me either, I just got the dummy output.
Disabled the modem built into my laptop in hardware drivers and sound
started working immediately. Sound preferences now lists all my sound
devices under the Hardware tab.

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[Karmic] processes holding /dev/dsp* or /dev/snd/pcm* cause "pulseaudio: card 
not found - Null Output / Dummy Output"
https://bugs.launchpad.net/bugs/394500
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