Install libqt5help5 by entering the following commands in the terminal:
sudo apt update sudo apt install libqt5help5
Description:
Qt 5 help module
Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. . The QtHelp module provides classes for integrating online documentation in applications.
Homepage: https://www.qt.io/developers/
Version: 5.9.5-0ubuntu1
Section: universe/libs