Comment 2 for bug 568129

Setting up dbus (1.2.16-2ubuntu4) ...
The system user `messagebus' already exists. Exiting.
Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
dpkg: error processing dbus (--configure):
 subprocess installed post-installation script returned error exit status 1