E: Problem executing scripts DPkg::Post-Invoke

[Felix Yan]

Binary package hint: packagekit

after running aptitude safe-upgrade, I got these messages:
Resolving dependencies...
No packages will be installed, upgraded, or removed.
0 packages upgraded, 0 newly installed, 0 to remove and 7 not upgraded.
Need to get 0B of archives. After unpacking 0B will be used.
Error org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1
E: Problem executing scripts DPkg::Post-Invoke '/usr/bin/test -S /var/run/dbus/system_bus_socket && /usr/bin/dbus-send --print-reply --system --dest=org.freedesktop.PackageKit --type=method_call /org/freedesktop/PackageKit org.freedesktop.PackageKit.StateHasChanged string:'cache-update' > /dev/null'
E: Sub-process returned an error code
A package failed to install. Trying to recover:

And all of these appeared after a upgrade of packagekit:
(GMT +8)

Start-Date: 2010-08-03 23:23:23
Upgrade: python-packagekit:amd64 (0.6.5-0ubuntu2, 0.6.6+20100703a-0ubuntu1), libpackagekit-qt-14:amd64 (0.6.5-0ubuntu2, 0.6.6+20100703a-0ubuntu1), packagekit:amd64 (0.6.5-0ubuntu2, 0.6.6+20100703a-0ubuntu1), libpackagekit-glib2-14:amd64 (0.6.5-0ubuntu2, 0.6.6+20100703a-0ubuntu1), packagekit-backend-apt:amd64 (0.6.5-0ubuntu2, 0.6.6+20100703a-0ubuntu1)

[Marco (0m3g4)]

after latest update,if i run "apt-get update", i have this error:

Error org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1

[Felix Yan (felixonmars)]

Same here, the latest update is:

Start-Date: 2010-08-04 07:15:38
Upgrade: python-packagekit:amd64 (0.6.6+20100703a-0ubuntu1, 0.6.6+20100703a-0ubuntu2), libpackagekit-qt-14:amd64 (0.6.6+20100703a-0ubuntu1, 0.6.6+20100703a-0ubuntu2), debhelper:amd64 (7.4.20ubuntu2, 7.4.20ubuntu3), libdbusmenu-glib1:amd64 (0.3.8-0ubuntu1, 0.3.9-0ubuntu1), libdbusmenu-gtk1:amd64 (0.3.8-0ubuntu1, 0.3.9-0ubuntu1), packagekit:amd64 (0.6.6+20100703a-0ubuntu1, 0.6.6+20100703a-0ubuntu2), libpackagekit-glib2-14:amd64 (0.6.6+20100703a-0ubuntu1, 0.6.6+20100703a-0ubuntu2), packagekit-backend-apt:amd64 (0.6.6+20100703a-0ubuntu1, 0.6.6+20100703a-0ubuntu2)

[Siegie (siegie)]

I have the same error as Marco, and it happend after the packagekit update.