I found these links similar to your problems tell us if it helps.
http://ubuntuforums.org/archive/index.php/t-655499.html
http://ubuntuforums.org/archive/index.php/t-87915.html
http://ge.ubuntuforums.com/showthread.php?t=889327
** Changed in: ubuntu
Status: Incomplete => New
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I can't listen logout sound
https://bugs.launchpad.net/bugs/267304
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