[ubuntu] No Theme sounds seem work. All other sound works.

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http://ubuntuforums.org – Iv'e read a lot of People are having problems with the system sounds don't play. I can play sounds when going into ; System Settings\sound\ sound effect tab There are no options here to select sound themes or anything like that. This plays sounds and I can listen to music, youtube.. etc. but I hear no Desktop system sound effects. log on/off , or minimizing windows, etc.. I successfully copied a new sound theme in usr/share/sounds and have gone back to default ubuntu theme. Still no sound played for system sounds. Lost system theme sounds. Don't know how to get it back. Anyone? Thanks so (Hardware)