Install calcurse by entering the following commands in the terminal:
sudo apt update sudo apt install calcurse
Description:
text-based calendar and todo manager
CalCurse is a calendar and todo list for the console which allows you to keep track of your appointments and everyday tasks. CalCurse has a nice textmode interface with configurable color schemes, configurable layout and Vi-like keybindings.
Homepage: http://calcurse.org
Version: 4.2.1-1.1
Section: universe/utils