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I usually run sound from my laptop through my headphone jack into a mixer so I can listen to music through my big PA speakers. The moment I upgraded the OS, however, it stopped working when plugged in, no audio at all. Sound still comes through the laptop speakers when unplugged, though. I dual boot, so I logged into Windows and the sound worked fine. What should I do to fix it?

Don
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    Welcome to Ask Ubuntu! This question should instead be filed as a bug report, thanks! [Instructions here](http://askubuntu.com/questions/5121/how-do-i-report-a-bug). – Jorge Castro May 02 '12 at 20:24

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Try alsa. You can install it by 

sudo apt-get install alsa-base alsa-utils
ashutosh
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