Docker - Docker not installed or not running

I need help what can I do?

docker.service - Docker Application Container Engine
   Loaded: loaded (/lib/systemd/system/docker.service; enabled)
   Active: failed (Result: start-limit) since Sat 2019-12-07 19:35:39 UTC; 24s a                                go
     Docs: https://docs.docker.com
  Process: 18311 ExecStart=/usr/bin/dockerd -H fd:// (code=exited, status=1/FAIL                                URE)
 Main PID: 18311 (code=exited, status=1/FAILURE)