How To Install Python-3.8.6 Into Ubuntu 20.04 LTS

Python-3.8.6.sh

# !/bin/sh

sudo apt update
sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev libsqlite3-dev wget libbz2-dev
sudo apt-get install build-essential checkinstall
sudo apt autoremove
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
cd /opt
sudo wget https://www.python.org/ftp/python/3.8.6/Python-3.8.6.tgz
sudo tar xzf Python-3.8.6.tgz
ls -la
sudo rm -f Python-3.8.6.tgz
cd Python-3.8.6
sudo ./configure --enable-optimizations
sudo make altinstall
sudo apt-get install python3-pip
python3.8 -V

sudo nano ~/.bashrc

# Add into the bottom 
alias python=python3
alias pip=pip3
# Save & Exit ctrl+s and ctrl+x

alias python=python3
alias pip=pip3
source ~/.bashrc
sudo apt update
sudo apt upgrade -y
python3 --version
python --version

pip3 --version
python3 --version
pip --version
python --version

sudo apt-get install build-essential checkinstall
sudo apt-get install libreadline-gplv2-dev libncursesw5-dev libssl-dev
libsqlite3-dev tk-dev libgdbm-dev libc6-dev libbz2-dev libffi-dev zlib1g-dev
cd /opt
sudo wget https://www.python.org/ftp/python/3.9.2/Python-3.9.2.tgz
sudo tar xzf Python-3.9.2.tgz
cd Python-3.9.2
sudo ./configure --enable-optimizations
sudo make altinstall
cd /usr/local/bin/
ls
update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 1
update-alternatives --install /usr/bin/python3 python3 /usr/local/bin/python3.9 2
update-alternatives --list python3
update-alternatives --config python3