flatpak command at the end of this step.
In order to install Google Calendar with GNOME Software, launch GNOME Software, which is called just Software, search for Google Calendar and finally click the Install button.
Alternatively, launch a Linux terminal emulator and type the command below and press the Enter key to install the package.
flatpak install nuvola eu.tiliado.NuvolaAppGoogleCalendar
Alternatively, you can launch Google Calendar from a terminal:
flatpak run eu.tiliado.NuvolaAppGoogleCalendar