硬件：Raspberry Pi 4B
系统：Ubuntu 19.10 (Eoan Ermine) for IOT
官网：https://ubuntu.com/download/iot/raspberry-pi
配置步骤
1. 下载系统镜像
http://cdimage.ubuntu.com/releases/19.10/release/ubuntu-19.10-preinstalled-server-arm64+raspi3.img.xz
2. 烧录至SD卡进行系统安装
3. 系统登陆
默认账号：ubuntu
默认密码：ubuntu
4. 更换镜像源
4.1 备份 apt 源文件
sudo cp -p /etc/apt/sources.list /etc/apt/sources.list.bak
4.2 编辑 apt 源文件，更新为国内镜像源（注意：路径节点不是 ubuntu，而是 ubuntu-ports）
sudo nano /etc/apt/sources.list
#阿里云源 deb https://mirrors.aliyun.com/ubuntu-ports/ disco main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu-ports/ disco main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu-ports/ disco-security main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu-ports/ disco-security main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu-ports/ disco-updates main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu-ports/ disco-updates main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu-ports/ disco-backports main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu-ports/ disco-backports main restricted universe multiverse deb https://mirrors.aliyun.com/ubuntu-ports/ disco-proposed main restricted universe multiverse deb-src https://mirrors.aliyun.com/ubuntu-ports/ disco-proposed main restricted universe multiverse #中科大源 deb https://mirrors.ustc.edu.cn/ubuntu-ports/ disco main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu-ports/ disco main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-updates main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-updates main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-backports main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-backports main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-security main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-security main restricted universe multiverse deb https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-proposed main restricted universe multiverse deb-src https://mirrors.ustc.edu.cn/ubuntu-ports/ disco-proposed main restricted universe multiverse
5. 安装桌面环境（可选择：xubuntu-desktop、lubuntu-desktop、kubuntu-desktop）
sudo apt-get install xubuntu-desktop
6. 重启系统
reboot
7. 安装 Docker
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sudo apt install docker.io
参考资料
https://ubuntu.com/download/iot
https://opsx.alibaba.com/mirror
https://mirrors.ustc.edu.cn/