Same problem for me after migrating t 14.04. Output is as below.
2014-06-13 19:05:59,546 - softwarecenter.backend.login_impl.login_sso - ERROR - _on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'GUINotAvailableError'), dbus.String(u'message'): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu-sso-login-qt\', \'ubuntu-sso-login-qt\')"). Aborting.')}, signature=dbus.Signature('ss')) ()
2014-06-13 19:05:59,547 - softwarecenter.backend.login_impl.login_sso - ERROR - _on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'GUINotAvailableError'), dbus.String(u'message'): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu-sso-login-qt\', \'ubuntu-sso-login-qt\')"). Aborting.')}, signature=dbus.Signature('ss')) ()
2014-06-13 19:05:59,547 - softwarecenter.backend.login_impl.login_sso - ERROR - _on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'GUINotAvailableError'), dbus.String(u'message'): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu-sso-login-qt\', \'ubuntu-sso-login-qt\')"). Aborting.')}, signature=dbus.Signature('ss')) ()
2014-06-13 19:05:59,548 - softwarecenter.backend.login_impl.login_sso - ERROR - _on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'GUINotAvailableError'), dbus.String(u'message'): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu-sso-login-qt\', \'ubuntu-sso-login-qt\')"). Aborting.')}, signature=dbus.Signature('ss')) ()
2014-06-13 19:05:59,548 - softwarecenter.backend.login_impl.login_sso - ERROR - _on_credentials_error for Ubuntu One: dbus.Dictionary({dbus.String(u'errtype'): dbus.String(u'GUINotAvailableError'), dbus.String(u'message'): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu-sso-login-qt\', \'ubuntu-sso-login-qt\')"). Aborting.')}, signature=dbus.Signature('ss')) ()
Same problem for me after migrating t 14.04. Output is as below.
2014-06-13 19:05:59,546 - softwarecenter. backend. login_impl. login_sso - ERROR - _on_credentials _error for Ubuntu One: dbus.Dictionary ({dbus. String( u'errtype' ): dbus.String( u'GUINotAvailab leError' ), dbus.String( u'message' ): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu- sso-login- qt\', \'ubuntu- sso-login- qt\')") . Aborting.')}, signature= dbus.Signature( 'ss')) () backend. login_impl. login_sso - ERROR - _on_credentials _error for Ubuntu One: dbus.Dictionary ({dbus. String( u'errtype' ): dbus.String( u'GUINotAvailab leError' ), dbus.String( u'message' ): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu- sso-login- qt\', \'ubuntu- sso-login- qt\')") . Aborting.')}, signature= dbus.Signature( 'ss')) () backend. login_impl. login_sso - ERROR - _on_credentials _error for Ubuntu One: dbus.Dictionary ({dbus. String( u'errtype' ): dbus.String( u'GUINotAvailab leError' ), dbus.String( u'message' ): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu- sso-login- qt\', \'ubuntu- sso-login- qt\')") . Aborting.')}, signature= dbus.Signature( 'ss')) () backend. login_impl. login_sso - ERROR - _on_credentials _error for Ubuntu One: dbus.Dictionary ({dbus. String( u'errtype' ): dbus.String( u'GUINotAvailab leError' ), dbus.String( u'message' ): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu- sso-login- qt\', \'ubuntu- sso-login- qt\')") . Aborting.')}, signature= dbus.Signature( 'ss')) () backend. login_impl. login_sso - ERROR - _on_credentials _error for Ubuntu One: dbus.Dictionary ({dbus. String( u'errtype' ): dbus.String( u'GUINotAvailab leError' ), dbus.String( u'message' ): dbus.String(u'Can not find a GUI to present to the user (tried with "(\'ubuntu- sso-login- qt\', \'ubuntu- sso-login- qt\')") . Aborting.')}, signature= dbus.Signature( 'ss')) ()
2014-06-13 19:05:59,547 - softwarecenter.
2014-06-13 19:05:59,547 - softwarecenter.
2014-06-13 19:05:59,548 - softwarecenter.
2014-06-13 19:05:59,548 - softwarecenter.
DISTRIB_ID=Ubuntu RELEASE= 14.04 CODENAME= trusty DESCRIPTION= "Ubuntu 14.04 LTS"
DISTRIB_
DISTRIB_
DISTRIB_