我今天尝试启动 Ubuntu 软件中心，但它没有启动，所以我尝试通过终端启动它，出现此错误：
2013-04-19 10:21:51,505 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2013-04-19 10:21:51,527 - softwarecenter.db.database - INFO - open() database: path=None use_axi=True use_agent=True
2013-04-19 10:21:51,755 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 410, '_introspect_error_handler')'
2013-04-19 10:21:51,754 - 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
这是在我安装了 LXDE 并开始使用它而不是 Unity 之后发生的，我认为这没有关系，但我认为你应该知道。
运行 Ubuntu 12.10 64 位