docker cant instal

[joemel]

Setting up docker.io (1.13.1-0ubuntu1~16.04.2) ...
addgroup: The group `docker' already exists as a system group. Exiting.
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: failed (Result: exit-code) since Sun 2018-04-29 10:42:58 IST; 7ms ago
     Docs: https://docs.docker.com
  Process: 10732 ExecStart=/usr/bin/dockerd -H fd:// $DOCKER_OPTS (code=exited, status=1/FAILURE)
 Main PID: 10732 (code=exited, status=1/FAILURE)

Apr 29 10:42:58 joemel-HP-EliteBook-8470p systemd[1]: Starting Docker Applica...
Apr 29 10:42:58 joemel-HP-EliteBook-8470p dockerd[10732]: no sockets found vi...
Apr 29 10:42:58 joemel-HP-EliteBook-8470p systemd[1]: docker.service: Main pr...
Apr 29 10:42:58 joemel-HP-EliteBook-8470p systemd[1]: Failed to start Docker ...
Apr 29 10:42:58 joemel-HP-EliteBook-8470p systemd[1]: docker.service: Unit en...
Apr 29 10:42:58 joemel-HP-EliteBook-8470p systemd[1]: docker.service: Failed ...
Hint: Some lines were ellipsized, use -l to show in full.
dpkg: error processing package docker.io (--configure):
 subprocess installed post-installation script returned error exit status 1
Errors were encountered while processing:
 docker.io
E: Sub-process /usr/bin/dpkg returned an error code (1)