I have previously get my sound to be working with this version after I follow the article here.
But just after I change the driver at Software and updates-> Additional Drivers to a proprietary drivers, the sound driver stop working. The problem persists even after I revert it back to the one which Ubuntu recommend (open source, tested). I tried to follow some of the help instructions given in other threads but they are not helpful.
The driver which I change is Advanced Micro Devices, Inc. [AMD/ATI]: Juniper XT [Radeon HD5770]
Edit 1: Attached my screen shot for Additional Drivers
Edited 2: Problem solved!
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