Install libplasma3 by entering the following commands in the terminal:
sudo apt update sudo apt install libplasma3
Description:
Plasma Library for the KDE Platform
This package contains the Plasma library. Plasma is one of the key technologies of KDE 4 (also known as the "Pillars of KDE"), and one of the most visible to users. It is the component that is "in charge" of the desktop interface; the desktop, panel (often referred simply as the task bar), and related elements. Plasma aims to change the traditional concepts of the "Desktop", incorporating semantic application elements, and bringing cooperating technologies to the user's fingertips in a way that is visually appealing while easing work flow. . It is part of the KDE Development Platform libraries module.
Homepage: http://plasma.kde.org/
Version: 4:4.14.38-0ubuntu3
Section: universe/libs