diff --git a/installer/installer-sudoers b/installer/installer-sudoers
index 6311c21..7ec4890 100644
--- a/installer/installer-sudoers
+++ b/installer/installer-sudoers
@@ -6,6 +6,6 @@
 #
 
 # Cmnd alias specification
-Cmnd_Alias INSTALLER = /usr/sbin/gparted, /usr/share/openmamba/installer/installer.sh, /usr/bin/udisks
+Cmnd_Alias INSTALLER = /usr/sbin/gparted, /usr/share/openmamba/installer/installer.sh, /usr/bin/udisks, /sbin/shutdown
 
 %sysadmin ALL = NOPASSWD: INSTALLER
diff --git a/installer/installer.kmdr b/installer/installer.kmdr
index f5b409b..40ffe99 100755
--- a/installer/installer.kmdr
+++ b/installer/installer.kmdr
@@ -3462,14 +3462,13 @@ fi
             </property>
             <property name="associations" stdset="0">
                 <stringlist>
-                    <string>if [ "$DESKTOP_SESSION" == "gnome" ]; then
+                    <string>if [ "$DESKTOP_SESSION" == "gnome" -o "$DESKTOP_SESSION" == "GNOME" ]; then
    gnome-session-save --shutdown-dialog
-elif [ "${DESKTOP_SESSION:0:3}" == "kde" -o "${KDE_FULL_SESSION}" == "true" ]; then
-   /usr/bin/qdbus org.kde.ksmserver /KSMServer logout 0 1 2
-elif [ "${DESKTOP_SESSION:0:3}" == "kde" ]; then
-   dcop ksmserver ksmserver logout 0 1 1
-else
+elif [ "$DESKTOP_SESSION" == "lxde" -o "$DESKTOP_SESSION" == "LXDE" ]; then
    shutdown now -r
+else
+# assume KDE4 as default (or use KDE_FULL_SESSION == true)
+   /usr/bin/qdbus org.kde.ksmserver /KSMServer logout 0 1 2
 fi
 </string>
                 </stringlist>