Don't know if bug #216483 is a duplicate.
I wrongly thought bug #235134 was a duplicate, where I have given the following 
solution.

I was having an almost identical error when plugging a usb key, and
finally did found that dbus policy was saying both one thing and then
the opposite, commenting out the opposite fixed it for me:

More precisely in /etc/dbus-1/system.d/hal.conf it says:
  <!-- Allow anyone to invoke methods on the Manager and Device interfaces -->
  <policy context="default">
...
     <allow send_interface="org.freedesktop.Hal.Device.Volume"/>

and later:
<!-- Default policy for the exported interfaces -->
  <policy context="default">
    <deny send_interface="org.freedesktop.Hal.Device.SystemPowerManagement"/>
    <deny send_interface="org.freedesktop.Hal.Device.VideoAdapterPM"/>
    <deny send_interface="org.freedesktop.Hal.Device.LaptopPanel"/>
    <deny send_interface="org.freedesktop.Hal.Device.Volume"/>
    <deny send_interface="org.freedesktop.Hal.Device.Volume.Crypto"/>
  </policy>
that I edited to become:
<!-- Default policy for the exported interfaces -->
  <policy context="default">
    <deny send_interface="org.freedesktop.Hal.Device.SystemPowerManagement"/>
    <deny send_interface="org.freedesktop.Hal.Device.VideoAdapterPM"/>
    <deny send_interface="org.freedesktop.Hal.Device.LaptopPanel"/>
    <!-- deny send_interface="org.freedesktop.Hal.Device.Volume"/ -->
    <!-- deny send_interface="org.freedesktop.Hal.Device.Volume.Crypto"/ -->
  </policy>

So I just commented out the last two deny lines (note the -- at the end
too! )

It is unclear to me if latest hal in hardy-updates have still this problem.
Intrepid version (older!?) does not have this problem, because it allows it 
always.

-- 
[Hardy] Can't auto-mount my USB harddrives!
https://bugs.launchpad.net/bugs/224085
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