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docker ps 永远挂起是第一个症状，所以我清除了 docker 并尝试重新安装......安装永远不会完成

dpkg -l|grep docker
iF  docker-ce                                  5:19.03.8~3-0~ubuntu-bionic                amd64        Docker: the open-source application container engine
ii  docker-ce-cli                              5:19.03.8~3-0~ubuntu-bionic                amd64        Docker CLI: the open-source application container engine

注意到上面安装的 docker 失败了iF...详情见dpkg -l | head -3

在 Ubuntu 20.04 上 docker 无法完成安装

sudo apt-get install docker-ce
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  aufs-tools cgroupfs-mount containerd.io docker-ce-cli pigz
The following NEW packages will be installed:
  aufs-tools …