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[ubuntu] No sound since Alsa lib update

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http://ubuntuforums.org – I'm running 64-bit Ubuntu 10.04 LTS on a Mac Mini. Sound has been iffy for a long time, not working for some users or situations, no sound over Skype, and when I'd run VLC, I'd almost always get a warning to update my alsa-lib (which was 1.21). I updated it and now I have no sound whatsoever. I've been Googling all day and trying various solutions, but no joy. Currently, here's what I see: The speaker icon on my task bar appears to be muted but when I click on it, the sound volume is all the way up and the Mute All option is grayed out. If I click on Sound Preferences, the dialog shows no H (Hardware)