Comment 3 for bug 1310475

This bug also occurs on Ubuntu 15.10. The following error is reported when "Turn on Recommendations" is selected:

2016-02-13 18:12:54,032 - 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')) ()
2016-02-13 18:12:54,033 - 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')) ()

The display is also grey on grey as mentioned by another poster (see attached image ) - not sure if this is a related issue?

Other warnings that are reported on start up are:

2016-02-13 18:04:08,924 - softwarecenter.backend.zeitgeist_logger - WARNING - Support for Zeitgeist disabled
2016-02-13 18:04:08,943 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2016-02-13 18:04:09,103 - softwarecenter.region - WARNING - failed to use geoclue: 'org.freedesktop.DBus.GLib.UnmappedError.GeoclueErrorQuark.Code1: Geoclue master client has no usable Address providers'
2016-02-13 18:04:09,230 - softwarecenter.backend.reviews - WARNING - Could not get usefulness from server, no username in config file
2016-02-13 18:04:09,252 - softwarecenter.db.pkginfo_impl.aptcache - INFO - aptcache.open()
/usr/bin/software-center:184: Warning: Source ID 69 was not found when attempting to remove it
  Gtk.main()
/usr/bin/software-center:184: Warning: Source ID 111 was not found when attempting to remove it
  Gtk.main()