Paul,
Not sure that this is a fix, and would not recommend anyone else try this 
without being aware there are pitfalls, though it does give some pointers as to 
where the error might lie.

When I removed the deny lines, I then found that the screen locked solid
for one user name, and (under my user name only) I got a "hal error"
pop-up, though was able to edit  and restore the previous
/etc/dbus-1/system.d/hal.conf.

My /etc/dbus-1/system.d/hal.conf contains the following deny lines:

  <!-- 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>

Perhaps you should detail which deny clauses you have on your system.

-- 
package hal 0.5.11~rc2-1ubuntu3 failed to install/upgrade: subprocess 
post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/206634
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