Comment 1 for bug 304532

Thanks for helping to make Ubuntu better.
There are already a few bugs, that describe this behaviour. Could it be that these bugs appeared after an update?
There are different bugs, but one bug that caused the shutdown to fail was fixed in the last days, you could check if you want, just enable the -proposed repository. (That was bug 274995)
And for the sound problem are also many open bugs, one is bug 288039.
If you think that your bug is a duplicate of one of those bugs (I assume so) then you should mark it as a duplicate.