Ubuntu 16.04 默认装的是 Python3.5
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方式一：
??sudo add-apt-repository ppa:jonathonf/python-3.6
??sudo apt-get update
??sudo apt-get install python3.6
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方式二：??
??wget https://www.python.org/ftp/python/3.6.5/Python-3.6.5.tar.xz
??tar xf Python-3.6.5.tar.xz
??cd Python-3.6.5
??./configure --enable-optimizations
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??sudo apt-get install -y make build-essential libssl-dev zlib1g-dev libbz2-dev \
????????libreadline-dev libsqlite3-dev wget curl llvm libncurses5-dev libncursesw5-dev xz-utils tk-dev
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??make && make install
??sudo make altinstall
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改变链接??
??sudo rm /usr/bin/python3
??ln -s /usr/local/bin/python3.6 /usr/bin/python3
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试了方式一装不了，方式二可以装，但改了链接后系统有些功能或程序会因为 Python 版本不对用不了
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原文：https://www.cnblogs.com/moonlight-lin/p/12592672.html