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Ubuntu 12.04 LTS- laptop speaker did not play sound during by rhythm box application

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linux-howto

http://askubuntu.com – I upgraded my laptop os to 12.04 LTS and played audio files using rhythm box player and suddenly the audio is not played in laptop speaker. I am able to test and verify the sound box setting tool, but i could not hear any sound from laptop speaker. Please help. (HowTos)