/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=en_US.
Start IM through /etc/X11/xinit/xinput.d/all_ALL linked to /etc/X11/xinit/xinput.d/default.
/usr/bin/startxfce4: X server already running on display :0

** (gnome-screensaver:2142): WARNING **: Failed to get session presence proxy: Could not get owner of name 'org.gnome.SessionManager': no such name
xfdesktop[2164]: starting up

(xfce4-mixer-plugin:2176): libxfce4mixer-CRITICAL **: xfce_mixer_get_track: assertion `GST_IS_MIXER (card)' failed

(xfce4-mixer-plugin:2176): xfce4-mixer-plugin-CRITICAL **: xfce_mixer_plugin_set_card: assertion `GST_IS_MIXER (card)' failed

(xfce4-mixer-plugin:2176): xfce4-mixer-plugin-CRITICAL **: xfce_mixer_plugin_set_track: assertion `GST_IS_MIXER_TRACK (track)' failed

** (xfwm4:2157): WARNING **: Unhandled keyboard shortcut

(polkit-gnome-authentication-agent-1:2208): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'

(polkit-gnome-authentication-agent-1:2208): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
** (update-notifier:2222): DEBUG: error during dbus call: The name org.debian.apt was not provided by any .service files

method return sender=:1.6 -> dest=:1.30 reply_serial=2