Install gir1.2-gtd-1.0 by entering the following commands in the terminal:
sudo apt update sudo apt install gir1.2-gtd-1.0
Description:
GObject introspection data for GNOME To Do
GNOME To Do is a simplistic personal task manager designed to perfectly fit the GNOME desktop. Designed from ground up to seamlessly integrate with the GNOME desktop environment, To Do enables you to be as productive as you want. . This package contains introspection data for GNOME To Do. . It can be used by packages using the GIRepository format to generate dynamic bindings.
Homepage: https://wiki.gnome.org/Apps/Todo
Version: 3.28.1-1
Section: introspection