Package includes a bash daemon (lubuntu-upg-notifier.sh) which checks if there are updates available. If there are it opens notifier.py which is a window that notifies about package updates available. If you decide to upgrade a full upgrade (not safe-upgrade) with the upgrader binary will take place.

Upgrader can also be run alone, it can be chosen to run cache update before and if a safe or full upgrade will be done. There is also a .desktop to call upgrader with cache update and a full upgrade.