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I could not hear audio.I install ubuntu 10 linux lucid and windows7.I am able to hear audio in windows but no sound in ubuntu. I have no sound card. How could I hear sound? My computers mother board is Gigabyte H55M-S2v.

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Please add some hardware information to your question:… – Jorge Castro Aug 16 '11 at 22:06

Follow the instructions provided at -- most likely it is something simple like muted audio or the wrong output setting.

To start troubleshooting the problem, run ubuntu-bug audio (either from a Terminal or using Alt+F2).

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