install python pip3 on ubuntu 20.04 code example

Example: ubuntu 20.04 pip2 install

sudo apt update
sudo apt install curl
sudo add-apt-repository universe
sudo apt update
sudo curl https://bootstrap.pypa.io/2.7/get-pip.py --output get-pip.py # Fetch get-pip.py for python 2.7 
sudo python2 get-pip.py
pip --version