install python 3.9 ubuntu
sudo apt-get install python3set python 3 as default ubuntu
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.4 1
sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.6 2set python 3 as default ubuntu
update-alternatives: error: no alternatives for python3Copyright © 2021 Codeinu
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