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Jan 31 11:17:08 emachine gnome-session[1466]: WARNING: Failed to start app: 
Unable to start application: Uitvoeren van dochterproces 
‘gnome-power-manager’ is mislukt (Bestand of map bestaat niet)
Jan 31 11:17:08 emachine gdm-session-worker[1777]: WARNING: Unable to load file 
'/etc/gdm/custom.conf': Bestand of map bestaat niet
Jan 31 11:17:08 emachine gdm-session-worker[1777]: GLib-GObject-CRITICAL: 
g_value_get_boolean: assertion `G_VALUE_HOLDS_BOOLEAN (value)' failed
Jan 31 11:17:08 emachine dbus[573]: [system] Activating service 
name='org.freedesktop.Accounts' (using servicehelper)

Jan 31 11:17:09  gdm-simple-greeter[1768]: last message repeated 4 times
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-WARNING: 
/build/buildd/gtk+3.0-3.4.2/./gtk/gtkwidget.c:7117: widget not within a 
GtkWindow
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-CRITICAL: 
gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-CRITICAL: 
gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-WARNING: 
gtk_widget_size_allocate(): attempt to allocate widget with width -47 and 
height -47
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-CRITICAL: 
gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-CRITICAL: 
gtk_widget_get_preferred_height_for_width: assertion `width >= 0' failed
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: Gtk-WARNING: 
gtk_widget_size_allocate(): attempt to allocate widget with width -47 and 
height -47
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: CRITICAL: get_column_number: 
assertion `i < gtk_tree_view_get_n_columns (treeview)' failed
Jan 31 11:17:09 emachine gdm-simple-greeter[1768]: CRITICAL: get_column_number: 
assertion `i < gtk_tree_view_get_n_columns (treeview)' failed



After upgrading to 12.04.1 LTS (from the previous LTS) my ubuntu will at times 
fail to show the login screen. Roundabout 4 out of 10 times of booting the 
"Ubuntu five dots"-screen disappears, no login screen (GDM) appears but only 
tty1, with "login: ".

If I then login and do "sudo gdm"

I get the message:

failed to acquire org.gnome.displaymanager
could not acquire name; bailing out.

Whatever I try I can't solve this problem. A reboot (or two or three)
may finally result in the normal GDM-login screen and Ubuntu working
normally.

Ps I have switched from lightdm to GDM because lightdm gave many more
problems than GDM now does.

Jeet suggests I report this as a bug

** Affects: gnome-session (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: bot-comment
-- 
no gdm at start up. only tty (not really working either)
https://bugs.launchpad.net/bugs/1110580
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