cat ~/Desktop/.xsession-errors.old
/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.
gnome-session[1195]: WARNING: Unable to find provider '''' of required component 'panel'
GNOME_KEYRING_CONTROL=/tmp/keyring-ZyTUdx
GNOME_KEYRING_CONTROL=/tmp/keyring-ZyTUdx
SSH_AUTH_SOCK=/tmp/keyring-ZyTUdx/ssh
GNOME_KEYRING_CONTROL=/tmp/keyring-ZyTUdx
SSH_AUTH_SOCK=/tmp/keyring-ZyTUdx/ssh

(gnome-power-manager:1236): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.25.12.is.2.25.11/gobject/gsignal.c:2275: signal `proxy-status' is invalid for instance `0x9397ab8'
Error executing command as another user: No authentication agent was found.
failed to create drawable
Window manager error: Unable to initialize Clutter.
Unable to find a synaptics device.

(polkit-gnome-authentication-agent-1:1265): GLib-GObject-WARNING **: cannot register existing type `_PolkitError'

(polkit-gnome-authentication-agent-1:1265): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
Initializing nautilus-gdu extension
** Message: pygobject_register_sinkfunc is deprecated (GtkWindow)
** Message: pygobject_register_sinkfunc is deprecated (GtkInvisible)
** Message: pygobject_register_sinkfunc is deprecated (GtkObject)
** (update-notifier:1308): DEBUG: Skipping reboot required