i had this problem too.

my status:
- dont have network manager installed.
- /etc/network/interfaces doesnt have an auto wlan0 entry
- im not applying the fix everyones using here (adding to alsa-utils the ifdown 
command)

the problem has gone away.

one thing i may add. this might be related to this bug: 
https://bugs.launchpad.net/ubuntu/+source/netbase/+bug/290230
since the moment i removed all configured networks, computer started shutting 
down correctly...

-- 
storing ALSA mixer element values during shutdown hangs nondeterministically if 
non-loopback network interfaces are still up
https://bugs.launchpad.net/bugs/274995
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