Setup Python3.8 in Ubuntu Xenial (16.04 LTS). The python version was fixed at Python 3.5.1

Setup Python3.8 in Ubuntu Xenial (16.04 LTS). The python version was fixed at Python 3.5.1 - setup-python3.8-via-ppa.sh

https://gist.github.com/ptantiku/aca8d955296d5dee01bd9ed1c3027d8c