Python3.9 on ubuntu22.04 Jammy

Python3.9 on ubuntu22.04 Jammy

## Install Python3.9 interpreter on ubuntu 22.04

On a terminal just do the following steps:

Install dependencies:

  sudo apt install tar build-essential checkinstall  libreadline-dev \
	libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev \
	libbz2-dev openssl libffi-dev

Download and untar the desired version: 
	
	mkdir -p $HOME/opt
	cd $HOME/opt
	curl -O https://www.python.org/ftp/python/3.9.9/Python-3.9.9.tgz
	tar -xzf Python-3.9.9.tgz
    

Install python3.9 while keeping python3.10 as the default python3 version on ubuntu 22.04.
    
    cd Python-3.9.9/ &&
    ./configure --enable-shared --enable-optimizations --prefix=/usr/local LDFLAGS="-Wl,--rpath=/usr/local/lib" &&
    sudo make altinstall


Check it was installed properly:

    >> python3.9 -V
  Python 3.9.9
    
Enjoy!