kernel
3.8.3-030803-generic #201303141650 SMP Thu Mar 14 20:58:52 UTC 2013 i686 i686 
i686 GNU/Linux
network-manager:
  Installed: 0.9.8.0-0ubuntu2
and related libnm* and libnl* libraries from raring
on the top of 12.10 quantal

The system shuts down correctly. Although I have not tried x86_64.

Ernie, I can only suggest to try
sudo stop network-manager
and check
ls -l /run/sendsigs.omit.d/
should be no files related to neworkmanager
ps axw | grep -ie '\(netw\|dhcl\|dns\)'

Have you tried any workarounds or debug scripts from similar bugs
(/etc/init.d/networking, some new jobs in /etc/inti,
scripts to save list of open files and running processes, etc.)?

Perhaps, there is something meaningful in the very last messages.
Try to login from a tty ([Ctrl+Alt+F1]),
sudo halt
and press [Ctrl+Alt+F1] again to suppress plymouth image.

The next step would be rising upstart log-priority.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1124803

Title:
  NetworkManager doesn't respond to SIGTERM in daemon mode

Status in NetworkManager:
  Fix Released
Status in “network-manager” package in Ubuntu:
  Fix Released
Status in “network-manager” package in Gentoo Linux:
  New

Bug description:
  NetworkManager does not respond to SIGTERM when started in daemon
  mode, as upstart does by default.  This also happens when running
  NetworkManager manually from the command line as long as the --no-
  daemon option is not used.

  This was reported upstream and was fixed by commit
    64342a313ef497fca8a4fb7567900d4a1460065f

  It appears that this bug forces upstart to SIGKILL NetworkManager during 
shutdown, which, amoung other things, means that n-m doesn't deconfigure 
network interfaces as intended.  This bug, along with bug 1124789 (in 
wpasupplicant), means that no attempt is made to disconnect from a wifi network 
during shutdown. This in turn triggers a bug in my BIOS which causes this 
system to hardlock in the middle of BIOS post when I reboot while still 
connected to a wifi network:
    http://thread.gmane.org/gmane.linux.kernel.wireless.general/102862

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: network-manager 0.9.6.0-0ubuntu7
  ProcVersionSignature: Ubuntu 3.5.0-24.37-generic 3.5.7.4
  Uname: Linux 3.5.0-24-generic x86_64
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: amd64
  Date: Wed Feb 13 22:32:52 2013
  IpRoute:
   default via 10.179.201.1 dev eth0  proto static
   10.179.201.0/24 dev eth0  proto kernel  scope link  src 10.179.201.80  
metric 1
   10.179.201.0/24 dev wlan0  proto kernel  scope link  src 10.179.201.105  
metric 9
   169.254.0.0/16 dev eth0  scope link  metric 1000
  MarkForUpload: True
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  SourcePackage: network-manager
  UpgradeStatus: Upgraded to quantal on 2012-10-20 (116 days ago)
  WpaSupplicantLog:

  mtime.conffile..etc.NetworkManager.NetworkManager.conf: 2012-03-21T22:57:56
  nmcli-dev:
   DEVICE     TYPE              STATE         DBUS-PATH
   wlan0      802-11-wireless   connected     
/org/freedesktop/NetworkManager/Devices/1
   eth0       802-3-ethernet    connected     
/org/freedesktop/NetworkManager/Devices/0
  nmcli-nm:
   RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   
WIFI       WWAN-HARDWARE   WWAN
   running         0.9.6.0    connected       enabled       enabled         
enabled    enabled         enabled

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