Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 586, in msg_reply_handler
    reply_handler(*message.get_args_list(**get_args_opts))
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 152, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 143, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 630, in call_blocking
    message, timeout)
DBusException: 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.