root@panel:~# sudo apt-get install docker-ce
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
  aufs-tools cgroupfs-mount pigz
The following NEW packages will be installed:
  aufs-tools cgroupfs-mount docker-ce pigz
0 upgraded, 4 newly installed, 0 to remove and 112 not upgraded.
Need to get 0 B/34.2 MB of archives.
After this operation, 182 MB of additional disk space will be used.
Do you want to continue? [Y/n] Y
Selecting previously unselected package pigz.
(Reading database ... 38250 files and directories currently installed.)
Preparing to unpack .../pigz_2.3.1-2_amd64.deb ...
Unpacking pigz (2.3.1-2) ...
Selecting previously unselected package aufs-tools.
Preparing to unpack .../aufs-tools_1%3a3.2+20130722-1.1ubuntu1_amd64.deb ...
Unpacking aufs-tools (1:3.2+20130722-1.1ubuntu1) ...
Selecting previously unselected package cgroupfs-mount.
Preparing to unpack .../cgroupfs-mount_1.2_all.deb ...
Unpacking cgroupfs-mount (1.2) ...
Selecting previously unselected package docker-ce.
Preparing to unpack .../docker-ce_18.03.1~ce-0~ubuntu_amd64.deb ...
Unpacking docker-ce (18.03.1~ce-0~ubuntu) ...
Processing triggers for man-db (2.7.5-1) ...
Processing triggers for libc-bin (2.23-0ubuntu9) ...
Processing triggers for systemd (229-4ubuntu21) ...
Setting up pigz (2.3.1-2) ...
Setting up aufs-tools (1:3.2+20130722-1.1ubuntu1) ...
Setting up cgroupfs-mount (1.2) ...
Setting up docker-ce (18.03.1~ce-0~ubuntu) ...
Job for docker.service failed because the control process exited with error code. See "systemctl status docker.service" and "journalctl -xe" for details.
invoke-rc.d: initscript docker, action "start" failed.
● docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled; vendor preset: enabled)
   Active: activating (auto-restart) (Result: exit-code) since Sun 2018-05-27 13:42:24 EDT; 14ms ago
     Docs: https://docs.docker.com
  Process: 18987 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=1/FAILURE)
 Main PID: 18987 (code=exited, status=1/FAILURE)

May 27 13:42:24 panel systemd[1]: Failed to start Docker Application Container Engine.
May 27 13:42:24 panel systemd[1]: docker.service: Unit entered failed state.
May 27 13:42:24 panel systemd[1]: docker.service: Failed with result 'exit-code'.
dpkg: error processing package docker-ce (--configure):
 subprocess installed post-installation script returned error exit status 1
Processing triggers for libc-bin (2.23-0ubuntu9) ...
Errors were encountered while processing:
 docker-ce
E: Sub-process /usr/bin/dpkg returned an error code (1)