I found in another post (sorry but I can't find now the URL) a solution
thats works for me:
In your /etc/init.d/alsa-utils file finds the " stop)" line and adds
these lines:
## start workarround for bug 355054
ifconfig eth0 down
ifconfig wlan0 down
## end workarround for bug 355054
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my laptop doesn't shutdown or reboot. i've posted an image.
https://bugs.launchpad.net/bugs/355054
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