KDE Network Manager problems resolved

OK, knetworkmanager is fixed. All I had to do was add this:

<policy user="|my_username|">
   <allow own="org.freedesktop.NetworkManagerInfo"/>
   <allow send_destination="org.freedesktop.NetworkManagerInfo"/>
   <allow send_interface="org.freedesktop.NetworkManagerInfo"/>
</policy>

to these two files:

/etc/dbus-1/system.d/knetworkmanager.conf
/etc/dbus-1/system.d/NetworkManager.conf


I killed all instances of NetworkManager, NetworkManagerDispatcher. and knetworkmanager, then started NetworkManager and knetworkmanager (without using kdesu). It came up without errors and it recognized my network devices--yeehaw. I may submit this to Ubuntu to see if there's a way to change the default policy. Hope this helps somebody else out there.

Edit: this is quite possibly related to Ubuntu Bug #50770.