Comment 11 for bug 613412

Still have the error:
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
Error org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited with unknown return code 1

Here are the outputs

# dpkg -l | grep packagekit
ii kpackagekit 0.6.0-0ubuntu3 KDE package management tool using PackageKit
rc libpackagekit-glib2-12 0.5.7-0ubuntu2 Advanced library for accessing PackageKit using GLib
ii libpackagekit-glib2-14 0.6.6+20100703a-0ubuntu3 Advanced library for accessing PackageKit using GLib
rc libpackagekit-qt-12 0.5.7-0ubuntu2 Library for accessing PackageKit using Qt.
ii libpackagekit-qt-14 0.6.6+20100703a-0ubuntu3 Library for accessing PackageKit using Qt.
ii packagekit 0.6.6+20100703a-0ubuntu3 provides a software installation daemon
ii packagekit-backend-apt 0.6.6+20100703a-0ubuntu3 APT backend for packagekit
ii python-packagekit 0.6.6+20100703a-0ubuntu3 PackageKit Python bindings

# grep DefaultBackend /etc/PackageKit/PackageKit.conf
DefaultBackend=aptcc