How to install specific python version in ubuntu

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Approach 1 – Install with Dead snakes

1. Update system

sudo apt update
sudo apt install -y software-properties-common

2. Add Deadsnakes PPA

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

3. Install required version (Ex. python 3.9)

sudo apt install -y python3.9

4. Verify the installed version 

python3.9 --version

5. Install development and Virtual environment(venv) packages

sudo apt install -y python3.9-venv python3.9-dev

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