the computer does not close clicking the applet shutdown

[claudio]

Description: Lubuntu precise (development branch)
Release: 12.04

lxpanel:
  Installato: 0.5.8+git20120212-0ubuntu3
  Candidato: 0.5.8+git20120212-0ubuntu3
  Tabella versione:
 *** 0.5.8+git20120212-0ubuntu3 0
        500 http://archive.ubuntu.com/ubuntu/ precise/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: lxpanel 0.5.8+git20120212-0ubuntu3
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic i686
ApportVersion: 2.0.1-0ubuntu2
Architecture: i386
Config_Home_Lubuntu:
 [Command]
 FileManager=pcmanfm %s
 Terminal=lxterminal -e
 Logout=lubuntu-logout
Date: Sat Apr 14 02:09:05 2012
ExecutablePath: /usr/bin/lxpanel
InstallationMedia: Lubuntu 12.04 "Precise Pangolin" - Beta i386 (20120328)
ProcCmdline: lxpanel --profile Lubuntu
SegvAnalysis: Skipped: missing required field "Disassembly"
Signal: 11
SourcePackage: lxpanel
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
XsessionErrors:
 (polkit-gnome-authentication-agent-1:1374): GLib-CRITICAL **: g_variant_new_string: assertion `string != NULL' failed
 (polkit-gnome-authentication-agent-1:1374): polkit-gnome-1-WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files
 (lxpanel:1369): Gtk-CRITICAL **: IA__gtk_widget_set_state: assertion `GTK_IS_WIDGET (widget)' failed
 (lxpanel:1369): Gtk-CRITICAL **: IA__gtk_widget_set_tooltip_text: assertion `GTK_IS_WIDGET (widget)' failed

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #853276, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.