目录
工具准备：
- SD卡
- 读卡器
- 镜像
1、镜像下载
https://ubuntu.com/
选择想要的版本下载
Ubuntu 18.04.4 LTS for raspberry pi：这个版本将会长时间支持更新，持续到2023年4月份
Ubuntu 19.10 for raspberry pi ：仅支持9个月的更新，持续到2020年6月份
所以本文首选Ubuntu 18.04.4 LTS镜像安装演示
下载连接：
Ubuntu Server 18.04.4 for Raspberry Pi 4 64-bit ：ubuntu-18.04.4-preinstalled-server-arm64+raspi3.img.xz
Ubuntu Server 18.04.4 for Raspberry Pi 4 32-bit ：ubuntu-18.04.4-preinstalled-server-armhf+raspi3.img.xz
Ubuntu Server 19.10 for Raspberry Pi 4 64-bit：ubuntu-19.10.1-preinstalled-server-arm64+raspi3.img.xz
Ubuntu Server 19.10 for Raspberry Pi 4 32-bit：ubuntu-19.10.1-preinstalled-server-armhf+raspi3.img.xz
2、镜像烧录
镜像烧录教程传送门：树莓派4b之镜像烧录（手把手完整版）
3、系统登陆
默认账号：ubuntu 默认密码：ubuntu
4、换源
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
清华源
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-updates main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-backports main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-security main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-security main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ disco-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.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
sudo apt install docker.io
8.、安装桌面环境（可选择：gnome xubuntu-desktop、lubuntu-desktop、kubuntu-desktop）
安装最新的gnome3.34c
因为网络原因，如果提示有安装出错，请再安装一次：
sudo apt-get install gnome --fix-missing
我们也可以安装更简单的图形界面 xubuntu-desktop
sudo apt-getinstall xinint
sudo apt-getxubuntu-desktop
参考资料
https://www.jianshu.com/p/3b60f8a778a7（本人的简书哦，整理原来的内容，并添加一些内容，然后贴在这里）
https://www.cnblogs.com/jinzesudawei/p/11701669.html
