我是使用docker和linux的新手，并且尝试在新的Ubuntu 20.04 LTS上安装docker。
I was following these instructions: https://www.digitalocean.com/community/tutorials/how-to-install-and-use-docker-on-ubuntu-20-04
When I arrived at this command: sudo apt install docker-ce, I got this error:
Reading package lists... Done
Building dependency tree
Reading state information... Done
docker-ce is already the newest version (5:19.03.9~3-0~ubuntu-focal).
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
1 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Do you want to continue? [Y/n] y
Setting up docker-ce (5:19.03.9~3-0~ubuntu-focal) ...
Job for docker.service failed because the control process exited with error code.
See "systemctl status docker.service" and "journalctl -xe" for details.
invoke-rc.d: initscript docker, action "start" failed.
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: activating (auto-restart) (Result: exit-code) since Sat 2020-05-23 22:00:38 CES
T; 8ms ago
TriggeredBy: ● docker.socket
Docs: https://docs.docker.com
Process: 15674 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containe
rd.sock (code=exited, status=1/FAILURE)
Main PID: 15674 (code=exited, status=1/FAILURE)
dpkg: error processing package docker-ce (--configure):
installed docker-ce package post-installation script subprocess returned error exit status
1
Errors were encountered while processing:
docker-ce
E: Sub-process /usr/bin/dpkg returned an error code (1)
有人可以帮我解决这个问题吗？
出于学习目的，我想知道哪里出了问题以及为什么。但是不是强制性的，只要它可以再次起作用。
非常感谢你。
