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Open a terminal and execute following commands: sudo apt install build-essential checkinstall sudo apt install libreadline-gplv2-dev libncursesw5-dev libssl-dev \ First of all, install essential packages for compiling source code.So follow the below instructions to install Python 3.9 using source code on Ubuntu 20.04 Linux system. But in some cases, you may need to install Python from the source code. We don’t recommend installing Python 3.9 packages from source code. You also have one more option to install Python 3.9 using source code. That’s it, You have successfully installed Python 3.9 on your Ubuntu 20.04 LTS system. Check the Python version by executing: python3.9 -V Wait for the installation to complete.sudo apt update sudo apt install python3.9 Once you added the PPA on your Ubuntu system, update the apt cache and install Python 3.9 on Ubuntu.sudo add-apt-repository ppa:deadsnakes/ppa Open a terminal by pressing CTRL+ALT+T and then configure deadsnakes PPA to your system.Use the Ubuntu package manager Apt to install Python 3.9 on Ubuntu Linux system. sudo apt update sudo apt install wget software-properties-common Installing Python 3.9 Using Apt Login to your Ubuntu system and open a terminal, then install some required packages. You can also choose the second method to install Python using source code. Use this tutorial to install Python 3.9 On Ubuntu 20.04 LTS Linux system via Apt-Get. You can choose deadsnakes PPA for Python installation on Ubuntu 20.04 system. It included multiple new modules, improved existing modules, and many other features. The Python 3.9 stable version has been released with several improvements and security updates. Python is used as a key language among the top tech companies like Google. It is open-source with a large community. Python is an object-oriented, high-level programming language.