重新啟動虛擬機后，命令 docker 映像命令顯示錯誤：Cannot connect to the Docker daemon at unix:///var/run/docker.sock. Is the docker daemon running?似乎 Docker 服務無法正常工作。我試圖在Ubuntu VM（v 20.10）上啟動docker服務，docker引擎的版本是20.10.5。我使用 systemctl 狀態 docker 進行故障排除顯示：docker.service - Docker Application Container Engine     Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)     Active: failed (Result: exit-code) since Sun 2021-06-06 03:32:23 UTC; 13min agoTriggeredBy: ● docker.socket       Docs: https://docs.docker.com    Process: 7228 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock (code=exited, status=2)   Main PID: 7228 (code=exited, status=2)Jun 06 03:32:20 cdipp-srv systemd[1]: Failed to start Docker Application Container Engine.Jun 06 03:32:23 cdipp-srv systemd[1]: docker.service: Scheduled restart job, restart counter is at 3.Jun 06 03:32:23 cdipp-srv systemd[1]: Stopped Docker Application Container Engine.Jun 06 03:32:23 cdipp-srv systemd[1]: docker.service: Start request repeated too quickly.Jun 06 03:32:23 cdipp-srv systemd[1]: docker.service: Failed with result 'exit-code'.Jun 06 03:32:23 cdipp-srv systemd[1]: Failed to start Docker Application Container Engine.