This should now be ready to upload (ish).

debian/lubuntu-update-notifier.postinst

@@ -0,0 +1,12 @@
+#!/bin/sh
+
+set -e
+
+# This file can be removed following the release of Lubuntu 24.04 LTS
+# It's to ensure a smooth transition between the autostart file and the new
+# systemd user units provided
+
+rm -f /etc/xdg/autostart/upg-notifier-autostart.desktop
+rm -f /home/*/.config/autostart/upg-notifier-autostart.desktop
+
+#DEBHELPER#

lubuntu-upg-notifier.sh

@@ -16,8 +16,6 @@
 # You should have received a copy of the GNU General Public License
 # along with this program. If not, see <http://www.gnu.org/licenses/>.
 
-while true;
-    do
 OUT=`/usr/lib/update-notifier/apt-check 2>&1`
 oldIFS=$IFS
 IFS=';'
@@ -38,5 +36,5 @@ while true;
 if [ "$NEWREL" -eq 0 ]; then
     VERSION=`echo $NEWREL_CHECK | awk -F\' '/available/{print $2}'`
 fi
+
 /usr/libexec/lubuntu-update-notifier/lubuntu-notifier.py -u $UPG -s $SEC -r $NEWREL -v $VERSION -p /usr/bin/lubuntu-upgrader
-done;