서버 : Vultr 클라우드
OS: Ubuntu 22.04 LTS
사용자 계정 생성하여 설치 진행함

1. Start with the system update

sudo apt update && sudo apt upgrade

2. Add PPA for Python old versions

sudo apt install software-properties-common

sudo add-apt-repository ppa:deadsnakes/ppa

3. Check Python Versions you want

sudo apt-cache policy python3.8

4. Install Python 3.8 on Ubuntu 22.04

sudo apt install python3.8

5. Install Python 3.9 on Ubuntu 22.04

sudo apt install python3.9

6. Set the default Python version

ls /usr/bin/python*

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.10 1

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.9 2

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.8 3

Switch the default Python version

sudo update-alternatives --config python

python -V

참고:

Install Python 3.9 or 3.8 on Ubuntu 22.04 LTS Jammy JellyFish (how2shout.com)