[lubuntu] No sound after installing ubuntu 12.04

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http://ubuntuforums.org – hi I’m running ubuntu 12.04 as a fresh update and found that ther is no sound playing. later found that there is no sound card displaying in the system setting sound menu. Also when i logged in as guest sound works properly. here I have attached the pic when I plugged a earphone i can hear sound but cannot be controlled by the system. the volume can only be controlled by application plz help Attached Images Screenshot from 2012-09-20 09:19:00.png (32.2 KB) (Hardware)