我在以 root 用户身份登录的 Mac 上的 Ubuntu 的流浪虚拟框中运行 docker，我试图从 devicemapper 切换到覆盖，但我收到一条错误消息：
root@vagrant-ubuntu-trusty-64:/# service docker stop
docker stop/waiting
root@vagrant-ubuntu-trusty-64:/# rm -rf /var/lib/docker
root@vagrant-ubuntu-trusty-64:/# docker daemon -s overlay
Command "daemon" is deprecated, and will be removed in Docker 1.16. Please run `dockerd` directly.
INFO[0000] libcontainerd: new containerd process, pid: 6788
WARN[0000] containerd: low RLIMIT_NOFILE changing to max current=1024 max=4096
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
Error starting daemon: error initializing graphdriver: driver not supported
root@vagrant-ubuntu-trusty-64:/#
我尝试了以下说明：
http://www.projectatomic.io/blog/2015/06/notes-on-fedora-centos-and-docker-storage-drivers/ 无法在 Ubuntu 16.04 中启动 Docker 服务
但它们都不适合我。
当我尝试遵循以下文档时：
https://docs.docker.com/engine/userguide/storagedriver/overlayfs-driver/
我被困在第 2 步，因为 grep 没有从 lsmod 返回任何“覆盖”：
root@vagrant-ubuntu-trusty-64:/# uname -r
3.13.0-107-generic
root@vagrant-ubuntu-trusty-64:/# lsmod | grep overlay
root@vagrant-ubuntu-trusty-64:/#
root@vagrant-ubuntu-trusty-64:/# dockerd --storage-driver=overlay
INFO[0000] libcontainerd: new containerd process, pid: 6816
WARN[0000] containerd: low RLIMIT_NOFILE changing to max current=1024 max=4096
ERRO[0001] 'overlay' not found as a supported filesystem on this host. Please ensure kernel is new enough and has overlay support loaded.
Error starting daemon: error initializing graphdriver: driver not supported
root@vagrant-ubuntu-trusty-64:/#
我该如何解决这个问题？