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https://bugs.launchpad.net/bugs/1205844

Title:
   software-center crashed with DBusException in call_blocking():
  org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper exited
  with unknown return code 1

Status in “software-center” package in Ubuntu:
  New

Bug description:
  i can't installl any package from software center. and it
  automatically closes whenever i try to install a software from it.

  i updated my ubuntu to the 13 th version now itself

  
  the terminal output is

  
   message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:40:46,875 - softwarecenter.db.pkginfo_impl.aptcache - ERROR - 
simulate failed
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1585, in 
on_error
      error.raise_exception()
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Launch helper 
exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:41:07,661 - softwarecenter.backend - WARNING - _on_trans_error: 
'DBusException('Launch helper exited with unknown return code 1',)' 'None' 
'artha'
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:41:24,517 - softwarecenter.backend - WARNING - _on_trans_error: 
'DBusException('Launch helper exited with unknown return code 1',)' 'None' 
'artha'
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:41:31,798 - softwarecenter.backend - WARNING - _on_trans_error: 
'DBusException('Launch helper exited with unknown return code 1',)' 'None' 
'artha'
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:41:33,201 - softwarecenter.backend - WARNING - _on_trans_error: 
'DBusException('Launch helper exited with unknown return code 1',)' 'None' 
'artha'
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  Traceback (most recent call last):
    File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 489, in 
_inline_callbacks
      result = gen.send(result)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1614, in 
_run_transaction_helper
      daemon = get_aptdaemon(self.bus)
    File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 1689, in 
get_aptdaemon
      False),
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
      follow_name_owner_changes=follow_name_owner_changes)
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in 
__init__
      self._named_service = conn.activate_name_owner(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in 
activate_name_owner
      self.start_service_by_name(bus_name)
    File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in 
start_service_by_name
      'su', (bus_name, flags)))
    File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in 
call_blocking
      message, timeout)
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: 
Launch helper exited with unknown return code 1
  2013-07-28 15:41:35,752 - softwarecenter.backend - WARNING - _on_trans_error: 
'DBusException('Launch helper exited with unknown return code 1',)' 'None' 
'artha'
  2013-07-28 15:41:36,944 - softwarecenter.ui.gtk3.widgets.exhibits - WARNING - 
download failed: '<class 'gi._glib.GError'>', 'Operation not supported'

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