Install libqt5websockets5 by entering the following commands in the terminal:
sudo apt update sudo apt install libqt5websockets5
Description:
Qt 5 Web Sockets module
Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. . This package contains a Qt library that implements WebSockets, both client and server.
Homepage: https://qt.io/
Version: 5.9.5-0ubuntu1
Section: universe/libs