Install libqwtmathml-qt5-6 by entering the following commands in the terminal:
sudo apt update sudo apt install libqwtmathml-qt5-6
Description:
Text Engine for Qwt (runtime, qt5)
The Qwt library contains Qt GUI Components and utility classes which are primarily useful for programs with a technical background. Most of these widgets are used to control or display values, arrays, or ranges of type double. . This package contains a text engine for the MathML renderer of the Qt solution package for the Qwt library and Qt5.
Homepage: http://qwt.sourceforge.net
Version: 6.1.3-1
Section: universe/libs