[ubuntu] Still can't hear audio after upgrade

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http://ubuntuforums.org – Can't hear audio after upgrading to U-10.04. If I restart in original install I can still hear audio. ???? Recently have installed other softwares thinking something might turn the speaker on, but it still doesn't have sound. And YES the audio level is on (not mute) and all the way up. Can I do a compare between the two different installations to see which file might be being looked for? (Hardware)