docker Job for docker.service failed because the control process exited with error code

so, it was problem of manage users/groups,

i tryed with sudo to pull ubuntu with docker :

sudo docker pull ubuntu
Using default tag: latest
latest: Pulling from library/ubuntu
fcee8bcfe180: Pull complete 
4cdc0cbc1936: Pull complete 
d9e545b90db8: Pull complete 
c4bea91afef3: Pull complete 
Digest: sha256:b53bb7b0d18842214ac7472c2a8801e8682c247d30f1ba4bab0083a2e2e091ea
Status: Downloaded newer image for ubuntu:latest

and here i try to run it, and it works ! :

sudo docker run -it --name ubuntu ubuntu
pass [sudo] de boblinux :
root@3a99cdd1c522:/# ls
bin   dev  home  lib64  mnt  proc  run   srv  tmp  var
boot  etc  lib   media  opt  root  sbin  sys  usr
root@3a99cdd1c522:/# exit
exit

I had faced the same problem, but the above solution did not help. I had to re-install docker to get this running back. This issue I suspect is I had resized (memory scaled up) the instance where docker was installed.