Oddly enough Adobe Flash Player, as in the pepper flash plugin, doesn’t seem to update automatically on my Ubuntu systems (3). And every time I forget how. And every time Google is not the quickest friend. So here is my own simple reminder:
apt show adobe-flasplugin
sudo update-pepperflashplugin-nonfree --status
sudo update-pepperflashplugin-nonfree --verbose --install