the sound problem can be solved by adding your login to the audio group
:

sudo adduser your_login audio

I didn't havfe the issue by installing ubuntu from the install DVD, but
as soon as I install some updates, I'm affected as well (I reinstalled
my computer several times to clarify the symptons)

I think it has something to do with permissions, both the audio & the
shutdown problem. Another symptom I see, is that all options are grayed
out in "System - Administration - Login Screen".

-- 
Unable to shutdown and restart, logs out instead
https://bugs.launchpad.net/bugs/576235
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