update xubuntu 13.04

Since a number of days I experience problems updating Xubuntu 13.04 (See copy of x-session-errors below) can anyone tell me please if this is a known issue? Thank you.

Script for cjkv started at run_im.
Script for default started at run_im.
openConnection: connect: Bestand of map bestaat niet
cannot connect to brltty at :0
Script for cjkv started at run_im.
Script for default started at run_im.

(xfce4-session:1885): GLib-WARNING **: GChildWatchSource: Exit status of a child process was requested but ECHILD was received by waitpid(). Most likely the process is ignoring SIGCHLD, or some other thread is invoking waitpid() with a nonpositive first argument; either behavior can break applications that use g_child_watch_add()/g_spawn_sync() either directly or indirectly.

(xfce4-indicator-plugin:1925): libindicator-WARNING **: IndicatorObject class does not have an accessible description.
?[31;01merror: option -s not recognized?[0m

(polkit-gnome-authentication-agent-1:1967): GLib-CRITICAL **: g_variant_new_string: assertion `string != NULL' failed

(polkit-gnome-authentication-agent-1:1967): polkit-gnome-1-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files

(xfce4-indicator-plugin:1925): Gtk-CRITICAL **: IA__gtk_widget_realize: assertion `GTK_WIDGET_ANCHORED (widget) || GTK_IS_INVISIBLE (widget)' failed
** Message: applet now removed from the notification area
/usr/lib/python2.7/dist-packages/gtk-2.0/gtk/__init__.py:127: RuntimeWarning: PyOS_InputHook is not available for interactive use of PyGTK
  set_interactive(1)

(update-notifier:1948): GLib-GObject-CRITICAL **: g_object_get_data: assertion `G_IS_OBJECT (object)' failed

(process:2077): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed

(process:2379): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed
Error: No running window found

(process:2382): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed

(Thunar:1898): Gdk-CRITICAL **: IA__gdk_window_get_window_type: assertion `GDK_IS_WINDOW (window)' failed