Docker安装完启动时提示Failed to start docker.service: Unit docker.service is masked.
Ubutntu安装完docker后,执行sudoservicedockerstart提示Failedtostartdocker.service:Unitdocker.serviceismasked.解决方案:执行如下三条指令systemctlunmaskdocker.servicesystemctlunmaskdocker.socketsystemctlstartdocker.service