softwarecenter not working

$ software-center
2015-10-21 12:19:47,718 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 607, in msg_reply_handler
    *message.get_args_list()))
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 69, in error_cb
    callback('')
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.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.
2015-10-21 12:20:34,336 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:20:34,336 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
2015-10-21 12:20:59,631 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:20:59,631 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, 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.
2015-10-21 12:21:00,118 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2015-10-21 12:21:00,126 - softwarecenter.plugin - INFO - activating plugin '<module 'webapps_activation' from '/usr/share/software-center/softwarecenter/plugins/webapps_activation.pyc'>'
2015-10-21 12:21:20,501 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:21:20,501 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
2015-10-21 12:21:45,779 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:21:45,779 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, 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.
2015-10-21 12:21:45,780 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
2015-10-21 12:21:46,203 - softwarecenter.backend.reviews - WARNING - error creating bsddb: '(22, 'Invalid argument -- BDB0054 illegal flag combination specified to DB_ENV->open')' (corrupted?)
2015-10-21 12:21:46,204 - softwarecenter.backend.reviews - ERROR - trying to repair DB failed
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/backend/reviews/__init__.py", line 358, in _save_review_stats_cache_blocking
    self._dump_bsddbm_for_unity(outfile, outdir)
  File "/usr/share/software-center/softwarecenter/backend/reviews/__init__.py", line 377, in _dump_bsddbm_for_unity
    0600)
DBInvalidArgError: (22, 'Invalid argument -- BDB0054 illegal flag combination specified to DB_ENV->open')
/usr/lib/python2.7/dist-packages/gi/overrides/GLib.py:560: Warning: Source ID 81 was not found when attempting to remove it
  return super(MainContext, self).iteration(may_block)
/usr/lib/python2.7/dist-packages/gi/overrides/GLib.py:548: Warning: Source ID 20 was not found when attempting to remove it
  super(MainLoop, self).run()
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 604, 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 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
2015-10-21 12:22:07,644 - softwarecenter.db.utils - INFO - software-center-agent finished with status 0
2015-10-21 12:22:51,640 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:22:51,640 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, 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.
2015-10-21 12:22:54,871 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:22:54,871 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
2015-10-21 12:23:20,166 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:23:20,166 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, 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.
2015-10-21 12:23:41,118 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:23:41,117 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)
2015-10-21 12:24:06,411 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/connection.py', 234, 'maybe_handle_message')'
2015-10-21 12:24:06,411 - dbus.connection - ERROR - Exception in handler for D-Bus signal:
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 230, in maybe_handle_message
    self._handler(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 65, in signal_cb
    callback(new_owner)
  File "/usr/share/software-center/softwarecenter/backend/installbackend_impl/aptd.py", line 169, in _register_active_transactions_watch
    current, queued = apt_daemon.GetActiveTransactions()
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, 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.
Killed