# 查询是否安装过 curl
which curl
# 查询是否安装过 docker
which docker

# 1. 删除软件以及安装时自动安装的所有包
sudo apt-get autoremove docker docker-ce docker-engine  docker.io  containerd runc -y
sudo apt-get autoremove docker docker-ce docker-engine  docker.io  containerd runc

# 2. 查看docker中其他没有卸载的包
dpkg -l | grep docker
如下图：

$ dpkg -l | grep docker
rc  docker-ce                                  5:20.10.17~3-0~ubuntu-focal           amd64        Docker: the open-source application container engine
ii  docker-ce-rootless-extras                  5:20.10.17~3-0~ubuntu-focal           amd64        Rootless support for Docker.
ii  docker-compose-plugin                      2.6.0~ubuntu-focal                    amd64        Docker Compose (V2) plugin for the Docker CLI.
ii  docker-scan-plugin                         0.17.0~ubuntu-focal                   amd64        Docker scan cli plugin.
rc  docker.io                                  20.10.12-0ubuntu2~20.04.1             amd64        Linux container runtime
rc  nvidia-docker2                             2.11.0-1                              all          nvidia-docker CLI wrapper

# 3. 卸载没有删除的docker相关插件
sudo apt remove (--purge docker-ce -y)
sudo apt-get autoremove (docker-ce-* -y)
sudo apt remove docker*
sudo apt-get autoremove docker*

# 4. 删除docker的相关配置&目录
sudo rm -rf /var/lib/docker
sudo rm -rf /var/lib/containerd
sudo rm -rf /var/run/docker*
sudo rm -rf /etc/systemd/system/docker.service.d

# 5. 确认docker卸载完毕
docker --version
which docker