Install etm by entering the following commands in the terminal:
sudo apt update sudo apt install etm
Description:
manages events and tasks using simple text files
Manage events and tasks using simple text files etm is an acronym for event and task manager. . In contrast to most calendar/todo applications, creating items (events, tasks, and so forth) in etm does not require filling out fields in a form. Instead, items are created as free-form text entries using a simple, intuitive format and stored in plain text files.
Homepage: http://people.duke.edu/~dgraham/etmtk/
Version: 3.2.30-1
Section: universe/utils