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[Launchpad Bug Tracker <590057@xxxxxxxxxxxxxxxxxx>]

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ubuntu 10.04 (fresh install) was working good, before it was restarted after an update this week.
from this point gnome does not load properly i.e.  an empty desktop with a background image appear. panels, desktop icons are not present. 10-30 secs later a mouse pointer appear with a pop-up window without borders with an error message: 
"No system tray detected on this system.  Unable to start, exiting.".  after clicking on OK button, mouse pointer turns into a black X and does not react any more.


here is the output of the xsession-errors file:

$ cat ~/.xsession-errors
/etc/gdm/Xsession: Beginning session setup...
Setting IM through im-switch for locale=de_DE.
Start IM through /home/mariya/.xinput.d/de_DE linked to /etc/X11/xinit/xinput.d/none.
gnome-session[1027]: WARNING: No required applications specified
GNOME_KEYRING_CONTROL=/tmp/keyring-cyyPsN
GNOME_KEYRING_PID=1123
GNOME_KEYRING_CONTROL=/tmp/keyring-cyyPsN
SSH_AUTH_SOCK=/tmp/keyring-cyyPsN/ssh
GNOME_KEYRING_CONTROL=/tmp/keyring-cyyPsN
SSH_AUTH_SOCK=/tmp/keyring-cyyPsN/ssh

(polkit-gnome-authentication-agent-1:1146): GLib-GObject-WARNING **:
cannot register existing type `_PolkitError'

(polkit-gnome-authentication-agent-1:1146): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
** (nm-applet:1145): DEBUG: old state indicates that this was not a disconnect 0

(gnome-power-manager:1141): GLib-GObject-WARNING **:
/build/buildd/glib2.0-2.24.1/gobject/gsignal.c:2273: signal `proxy-
status' is invalid for instance `0x9321838'

** (gnome-power-manager:1141): WARNING **: Either HAL or DBUS are not
working!

** (gnome-power-manager:1141): WARNING **: proxy failed

** (gnome-power-manager:1141): WARNING **: failed to get Computer root
object

** (gnome-power-manager:1141): WARNING **: proxy NULL!!

(gnome-power-manager:1141): GLib-GObject-WARNING **: value "-nan" of
type `gdouble' is invalid or out of range for property `percentage' of
type `gdouble'

(gnome-power-manager:1141): GLib-GObject-WARNING **: value "-nan" of
type `gdouble' is invalid or out of range for property `percentage' of
type `gdouble'

(gnome-power-manager:1141): GLib-GObject-WARNING **: value "-nan" of
type `gdouble' is invalid or out of range for property `percentage' of
type `gdouble'

(gnome-power-manager:1141): GLib-GObject-WARNING **: value "-nan" of type `gdouble' is invalid or out of range for property `percentage' of type `gdouble'
** (nm-applet:1145): DEBUG: foo_client_state_changed_cb
/usr/lib/pymodules/python2.6/gtk-2.0/gtk/__init__.py:127: RuntimeWarning: PyOS_InputHook is not available for interactive use of PyGTK
  set_interactive(1)
** (nm-applet:1145): DEBUG: foo_client_state_changed_cb

** (gnome-settings-daemon:1125): CRITICAL **: setup_bg: assertion `manager->priv->bg == NULL' failed
evolution-alarm-notify-Message: Setting timeout for 50292 1275775200 1275724908
evolution-alarm-notify-Message:  Sun Jun  6 00:00:00 2010

evolution-alarm-notify-Message:  Sat Jun  5 10:01:48 2010

** (update-notifier:1443): DEBUG: Skipping reboot required
error:  No system tray detected on this system.  Unable to start, exiting. 


1. however, keybord works, so I am able to switch to tty terminal and
from there I am able manually start gnome-panel, nautilus and with
DISPLAY=:0.0 <app-name>

2. I checked to ensure, that the file system is ok, by creating/touching
a file /forcefsck

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

-- 
gnome does not start after an update
https://bugs.launchpad.net/bugs/590057
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