problemas al arrancar ubuntu ,no siempre

Imagen de gusanet
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cuando voy a iniciar unas veces arranca normal y otras no inicia hasta la sexta o Backend : gconf
Integration : true
Profile : unity
Adding plugins
libprotobuf ERROR google/protobuf/message_lite.cc:123] Can't parse message of type "metadata.PluginBrief" because it is missing required fields: info
Initializing core options...done
Initializing composite options...done
Initializing opengl options...done
Initializing decor options...done
Initializing water options...done
Initializing move options...done
Initializing imgjpeg options...done
Initializing gnomecompat options...done
Initializing place options...done
Initializing resize options...done
Initializing mousepoll options...done
Initializing grid options...done
Initializing animation options...done
Initializing wobbly options...done
Initializing wallpaper options...done
I/O warning : failed to load external entity "/home/castor/.compiz/session/10db3ff3a82cf749bc138511771438027000000013850034"
Initializing session options...done
Initializing screenshot options...done
Initializing cube options...done
compiz (expo) - Warn: failed to bind image to texture
Initializing expo options...done
Initializing ezoom options...done
Initializing rotate options...done
Initializing scale options...done
Initializing td options...done
Initializing showmouse options...done

(compiz:1582): GConf-CRITICAL **: gconf_client_add_dir: assertion `gconf_valid_key (dirname, NULL)' failed
Initializing unityshell options...done
Initializing unitymtgrabhandles options...done
** Message: applet now removed from the notification area
** Message: using fallback from indicator to GtkStatusIcon
Setting Update "main_menu_key"
Setting Update "run_key"
Setting Update "multioutput_mode"
Setting Update "skydome"
Setting Update "skydome_animated"
Setting Update "skydome_gradient_start_color"
Setting Update "skydome_gradient_end_color"
Setting Update "edge_flip_window"
Setting Update "raise_on_rotate"
Setting Update "launcher_hide_mode"
Setting Update "edge_responsiveness"
** Message: moving back from GtkStatusIcon to indicator
Nautilus-Share-Message: Called "net usershare info" but it failed: La «red compartida» devolvió el error 255: net usershare: cannot open usershare directory /var/lib/samba/usershares. Error No existe el archivo o el directorio
Please ask your system administrator to enable user sharing.

** (nautilus:1617): CRITICAL **: syncdaemon_interface_get_proxy_object: assertion `SYNCDAEMON_IS_INTERFACE (interface)' failed intento
el archivo de sesion de error me da esto ( no lo entiendo )