Before you start creating applications with PySide2 you will need to have a working installation on your system. If you don't have either set up yet, the following steps will guide you through how to do this on Ubuntu Linux.
Install PySide2 on Ubuntu Linux
The simplest way to install PySide2 on Linux is to use Python's
pip packaging tool, just as for other packages.
For Python3 installations this is usually called
pip3 install pyside2
After install is finished, you should be able to run
import PySide2 without errors.
Type "help", "copyright", "credits" or "license" for more information.
>>> import PySide2
You can now start creating Python GUI applications with PySide2.