Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?

执行了systemctl daemon-reload 可以了，但是接着执行sudo service docker restart又报下面的错误“

Failed to start docker.service: Unit docker.service not found.

然后我又重启了Ubuntu，这次我不在Moba连接的session里操作了，我直接在Ubuntu里执行sudo docker ps -a，结果又好了！！

再通过Moba session连上Ubuntu