Every few weeks, I get a warning from Firefox (my default browser) that an update is not implemented. This is due to Ubuntu 22.0 adopting the snap technology for handling its packages and their updates. Supposedly helping with handling versions and dependences. This update can be done with the line command
sudo snap refresh firefox
which remains long enough in the history file for me to cut&paste it the next time the warning appears, but it is mildly annoying when all other updates are automatically handled by Discover.