In my case, I resolved it that way:
NetworkManager blocked poweroff.
Solution (in my case):
--- /etc/init/network-manager.conf.orig 2010-05-03 14:56:09.745071317 +0200
+++ /etc/init/network-manager.conf 2010-05-03 14:56:43.075152939 +0200
@@ -8,6 +8,7 @@
start on (local-filesystems
and started dbus)
stop on stopping dbus
+stop on runlevel [06]
expect fork
respawn
--
[Karmic] Hangs during shutdown with kernel 2.6.31-7
https://bugs.launchpad.net/bugs/418509
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