ubuntu20.04.2 install python 3.8

1: sudo add-apt-repository ppa:deadsnakes/ppa

2: sudo apt update

3: sudo apt install python3.8

4: sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1

5: sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2

6: sudo update-alternatives --config python3

Uninstall:

To uninstall the Python3.8 packages, run command:

sudo apt remove --autoremove python3.8 python3.8-minimal