Install cantor-backend-qalculate by entering the following commands in the terminal:
sudo apt update sudo apt install cantor-backend-qalculate
Qalculate! backend for Cantor
Cantor is an application to allow you to you use your favorite mathematical applications from within an elegant worksheet interface. It provides dialogs to assist with common tasks and allows you to share your worksheets with others. . This package provides the backend for using the Qalculate! calculator (http://qalculate.sourceforge.net/) in Cantor. . This package is part of the KDE education module.