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use python3 as default ubuntu

compgen -c python
sudo su
update-alternatives --install /usr/bin/python python /usr/bin/python3 1
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set 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 2
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set python3.7 as default ubuntu

sudo update-alternatives --install /usr/bin/python python /usr/bin/python3.7 1
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set python 3 as default ubuntu

sudo update-alternatives --config python
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Make python3 default in ubuntu

sudo apt install python-is-python3
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 2
sudo update-alternatives --config python
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set python 3 as default ubuntu

update-alternatives: error: no alternatives for python3
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