ubuntu nainstalovat python
# first do:
sudo apt-get update
# after do:
sudo apt-get install python3.6
# then it should be installed
aktualizace ubuntu python 3.85
sudo apt-get install python3.8
aktualizace ubuntu python 3.85
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.6 1
sudo update-alternatives --install /usr/bin/python3 python3 /usr/bin/python3.8 2
aktualizace ubuntu python 3.85
sudo update-alternatives --config python3
aktualizace python ubuntu
$ sudo apt update -y
$ sudo apt install python3.7