I really appreciate the ability of Webmin to handle all upgrades to the system from one simple location. When started up, it will check for available upgrades and then tell how many are available. However, it is always one off. If it says four, there are only three, and if it states three, there are only two.
While I am writing this, a pop-up message said there was one new update available. However, when I clicked on the message it took me to Software Package Updates and displayed "No packages available to be updated were found". Go figure.