Sure.  Console log follows:

root@bowie:~# /usr/lib/packagekit/packagekitd --verbose
00:27:27        PackageKit          Verbose debugging enabled (on console 1)
/usr/lib/packagekit/packagekitd: symbol lookup error: 
/usr/lib/packagekit/packagekitd: undefined symbol: g_unix_signal_add_watch_full

A google search of the error finds this:
https://bugzilla.redhat.com/show_bug.cgi?id=736880

Here's the output of "apt-get install" showing the urls and version
numbers involved:

root@bowie:~# apt-get install kpackagekit packagekit-backend-aptcc
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  libdebconf-kde0 libpackagekit-glib2-14 libpackagekit-qt14 packagekit
  python-packagekit update-manager-kde
Suggested packages:
  packagekit-backend-apt packagekit-backend-smart
The following NEW packages will be installed:
  kpackagekit libdebconf-kde0 libpackagekit-glib2-14 libpackagekit-qt14 
packagekit
  packagekit-backend-aptcc python-packagekit update-manager-kde
0 upgraded, 8 newly installed, 0 to remove and 98 not upgraded.
Need to get 1,639 kB of archives.
After this operation, 6,472 kB of additional disk space will be used.
Do you want to continue [Y/n]? 
Get:1 http://us.archive.ubuntu.com/ubuntu/ oneiric/main libdebconf-kde0 i386 
0.1+git20110702-1 [33.7 kB]
Get:2 http://us.archive.ubuntu.com/ubuntu/ natty/main libpackagekit-qt14 i386 
0.6.11-2ubuntu3 [105 kB]
Get:3 http://us.archive.ubuntu.com/ubuntu/ oneiric/main update-manager-kde all 
1:0.152.17 [5,264 B]
Get:4 http://us.archive.ubuntu.com/ubuntu/ oneiric/universe 
libpackagekit-glib2-14 i386 0.6.15-1build1 [113 kB]
Get:5 http://us.archive.ubuntu.com/ubuntu/ oneiric/universe python-packagekit 
all 0.6.15-1build1 [32.6 kB]
Get:6 http://us.archive.ubuntu.com/ubuntu/ oneiric/universe 
packagekit-backend-aptcc i386 0.6.15-1build1 [112 kB]
Get:7 http://us.archive.ubuntu.com/ubuntu/ oneiric/universe packagekit i386 
0.6.15-1build1 [752 kB]
Get:8 http://us.archive.ubuntu.com/ubuntu/ natty/main kpackagekit i386 
0.6.3.3-0ubuntu2 [486 kB]
Fetched 1,639 kB in 10s (153 kB/s)                                              
       
Selecting previously deselected package libdebconf-kde0.
(Reading database ... 579438 files and directories currently installed.)
Unpacking libdebconf-kde0 (from .../libdebconf-kde0_0.1+git20110702-1_i386.deb) 
...
Selecting previously deselected package libpackagekit-qt14.
Unpacking libpackagekit-qt14 (from 
.../libpackagekit-qt14_0.6.11-2ubuntu3_i386.deb) ...
Selecting previously deselected package update-manager-kde.
Unpacking update-manager-kde (from .../update-manager-kde_1%3a0.152.17_all.deb) 
...
Selecting previously deselected package libpackagekit-glib2-14.
Unpacking libpackagekit-glib2-14 (from 
.../libpackagekit-glib2-14_0.6.15-1build1_i386.deb) ...
Selecting previously deselected package python-packagekit.
Unpacking python-packagekit (from .../python-packagekit_0.6.15-1build1_all.deb) 
...
Selecting previously deselected package packagekit-backend-aptcc.
Unpacking packagekit-backend-aptcc (from 
.../packagekit-backend-aptcc_0.6.15-1build1_i386.deb) ...
Selecting previously deselected package packagekit.
Unpacking packagekit (from .../packagekit_0.6.15-1build1_i386.deb) ...
Selecting previously deselected package kpackagekit.
Unpacking kpackagekit (from .../kpackagekit_0.6.3.3-0ubuntu2_i386.deb) ...
Processing triggers for man-db ...
Processing triggers for shared-mime-info ...
Unknown media type in type 'virtual/bluedevil-input'
Unknown media type in type 'virtual/bluedevil-audio'
Unknown media type in type 'virtual/bluedevil-sendfile'
Unknown media type in type 'all/all'
Unknown media type in type 'all/allfiles'
Unknown media type in type 'uri/mms'
Unknown media type in type 'uri/mmst'
Unknown media type in type 'uri/mmsu'
Unknown media type in type 'uri/pnm'
Unknown media type in type 'uri/rtspt'
Unknown media type in type 'uri/rtspu'
Unknown media type in type 'interface/x-winamp-skin'
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf.index...
Processing triggers for gnome-menus ...
Processing triggers for desktop-file-utils ...
Setting up libdebconf-kde0 (0.1+git20110702-1) ...
Setting up libpackagekit-qt14 (0.6.11-2ubuntu3) ...
Setting up update-manager-kde (1:0.152.17) ...
Setting up libpackagekit-glib2-14 (0.6.15-1build1) ...
Setting up python-packagekit (0.6.15-1build1) ...
Setting up packagekit-backend-aptcc (0.6.15-1build1) ...
Setting up packagekit (0.6.15-1build1) ...
Setting up kpackagekit (0.6.3.3-0ubuntu2) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place

So... probably I want to do "apt-get source packagekit" followed by
"debuild binary" etc.

Doing that now.

** Bug watch added: Red Hat Bugzilla #736880
   https://bugzilla.redhat.com/show_bug.cgi?id=736880

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https://bugs.launchpad.net/bugs/847591

Title:
  Error org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper
  exited with unknown return code 127

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