Ubuntu20.04安装Docker

官方安装地址：Install Docker Engine on Ubuntu | Docker Documentation

卸载旧版本

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sudo apt-get remove docker docker-engine docker.io containerd runc

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使用仓库安装Docker

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sudo apt-get update

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sudo apt-get install \
    ca-certificates \
    curl \
    gnupg \
    lsb-release

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sudo mkdir -p /etc/apt/keyrings
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curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /etc/apt/keyrings/docker.gpg

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echo \
  "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu \
  $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null

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安装Docker Engine

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sudo apt-get update

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sudo chmod a+r /etc/apt/keyrings/docker.gpg
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sudo apt-get update

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终极一步

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sudo apt-get install docker-ce docker-ce-cli containerd.io docker-compose-plugin

输出Hello World

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安装完毕！