Install zenity by entering the following commands in the terminal:
sudo apt update sudo apt install zenity
Description:
Display graphical dialog boxes from shell scripts
Zenity allows you to display GTK+ dialogs from shell scripts; it is a rewrite of the `gdialog' command from GNOME 1. . Zenity includes a gdialog wrapper script so that it can be used with legacy scripts.
Homepage: https://wiki.gnome.org/Projects/Zenity
Version: 3.28.1-1
Section: gnome