[Bug 1068680] Re: Software center does not start [dbus.proxies - ERROR - Introspect error]

[den.t]

I used to get the same exception. Running /usr/lib/ubuntu-sso-client
/ubuntu-sso-login manually resulted in the following exception:

Traceback (most recent call last):
  File "/usr/lib/ubuntu-sso-client/ubuntu-sso-login", line 66, in <module>
    from ubuntu_sso.main import main
  File "/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/__init__.py", line 96, in <module>
    from ubuntu_sso.main import linux as source
  File "/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/linux.py", line 464, in <module>
    from ubuntu_sso.main import qt
  File "/usr/lib/python2.7/dist-packages/ubuntu-sso-client/ubuntu_sso/main/qt.py", line 39, in <module>
    from PyQt4 import QtCore
RuntimeError: the sip module implements API v9.0 to v9.1 but the PyQt4.QtCore module requires API v8.1

It seemed to be a problem with python-sip and python-qt4. Re-installing
both packages fixed it for me.

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Title:
  Software center does not start [dbus.proxies - ERROR - Introspect
  error]

Status in Ubuntu Single Sign On Client:
  New
Status in “dbus-python” package in Ubuntu:
  Confirmed

Bug description:
  If I type
   software-center
  in the terminal, I get the following error and the program do not start:
  2012-10-19 11:47:14,260 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
  2012-10-19 11:47:14,369 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
  2012-10-19 11:47:17,104 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 410, '_introspect_error_handler')'
  2012-10-19 11:47:17,104 - dbus.proxies - ERROR - Introspect error on com.ubuntu.sso:/com/ubuntu/sso/credentials: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1
  Traceback (most recent call last):
    File "/usr/bin/software-center", line 130, in <module>
      app = SoftwareCenterAppGtk3(options, args)
    File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 337, in __init__
      self.icons)
    File "/usr/share/software-center/softwarecenter/ui/gtk3/session/appmanager.py", line 66, in __init__
      self.oauth_token = helper.find_oauth_token_sync()
    File "/usr/share/software-center/softwarecenter/backend/ubuntusso.py", line 139, in find_oauth_token_sync
      sso.find_credentials()
    File "/usr/share/software-center/softwarecenter/backend/login_impl/login_sso.py", line 75, in find_credentials
      self.proxy.find_credentials(self.appname, self._get_params())
    File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
      return self._proxy_method(*args, **keywords)
    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.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: software-center 5.4.1.2
  ProcVersionSignature: Ubuntu 3.5.0-17.28-generic 3.5.5
  Uname: Linux 3.5.0-17-generic i686
  ApportVersion: 2.6.1-0ubuntu3
  Architecture: i386
  Date: Fri Oct 19 11:48:12 2012
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=pt_BR:
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=pt_BR.UTF-8
   SHELL=/bin/bash
  SourcePackage: software-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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