我正在尝试在远程Web服务器上安装Docker，但是我遇到了一个令人沮丧的错误。我已经多次在此操作系统上安装了Docker，但从未出现过这种情况。
当执行命令sudo apt-get install -y docker-engine时，我卡在了这里，因为无法安装Docker引擎：
~# systemctl status docker.service
● docker.service - Docker Application Container Engine
Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since So 2017-03-05 17:47:20 CET; 32s ago
Docs: https://docs.docker.com
Main PID: 18194 (code=exited, status=1/FAILURE)
dockerd[18194]: time="2017-03-05T17:47:20.567753592+01:00" level=error msg="'overlay' not found as a supported filesystem on this host. Please e
dockerd[18194]: time="2017-03-05T17:47:20.569299675+01:00" level=error msg="'overlay' not found as a supported filesystem on this host. Please e
dockerd[18194]: time="2017-03-05T17:47:20.591796895+01:00" level=info msg="Graph migration to content-addressability took 0.00 seconds"
dockerd[18194]: time="2017-03-05T17:47:20.592394882+01:00" level=warning msg="Your kernel does not support oom control"
dockerd[18194]: time="2017-03-05T17:47:20.592410368+01:00" level=warning msg="Your kernel does not support memory swappiness"
dockerd[18194]: time="2017-03-05T17:47:20.592421460+01:00" level=warning msg="Your kernel does not support kernel memory limit"
dockerd[18194]: time="2017-03-05T17:47:20.592427398+01:00" level=warning msg="Unable to find cpu cgroup in mounts"
dockerd[18194]: time="2017-03-05T17:47:20.592458649+01:00" level=warning msg="Unable to find cpuset cgroup in mounts"
dockerd[18194]: time="2017-03-05T17:47:20.592490516+01:00" level=warning msg="mountpoint for pids not found"
dockerd[18194]: Error starting daemon: Devices cgroup isn't mounted
我将root用户添加到了组中，并找到了一个建议，要在/etc/default/grub文件中添加
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"，但是该文件不存在！我还尝试了
sudo apt-get install cgroupfs-mount，但没有成功 :-(感谢您的帮助！