Compiled PySide2 for Qt 5.12 on ARM system (exp. on Nvidia Jetson Nano). Tested on Ubuntu 20.04 (upgraded Ubuntu 18.04 JetPack 4) with Python 3.6(m).
First, you have to upgrade your Ubuntu to 20.04, see UPGRADE_UBUNTU.md.
After than, you can install PySide2 following the wiki: INSTALL_PYSIDE2.md.
To install PySide2 + shiboken2 execute the command:
pip3 install *.whl
This wheel package is only for aarch64 systems.
Also, the machine needs to have Qt 5.12 on board, Python3... it's not done yet - I didn't tested it on old linux and other systems, but it have to work with Python 3.6 and Ubuntu 20.04+.