Crouton: fail to use docker on my chromebook pixel in crouton.

I fail to use docker on my chromebook pixel in crouton.
this is the error:

$ docker pull
docker: "pull" requires 1 argument.
See 'docker pull --help'.

Usage:  docker pull [OPTIONS] NAME[:TAG|@DIGEST]

Pull an image or a repository from a registry

$ docker pull ubuntu
Using default tag: latest
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

$ sudo docker pull ubuntu
Using default tag: latest
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

sudo docker daemon
WARN[0000] Your Linux kernel version 3.8.11 can be unstable running docker. Please upgrade your kernel to 3.10.0. 
ERRO[0000] [graphdriver] prior storage driver "devicemapper" failed: Error running deviceCreate (CreatePool) dm_task_run failed 
FATA[0000] Error starting daemon: error initializing graphdriver: Error running deviceCreate (CreatePool) dm_task_run failed 

and here is the information of core:

$ uname -a
Linux localhost 3.8.11 #1 SMP Mon Nov 16 23:42:11 PST 2015 x86_64 x86_64 x86_64 GNU/Linux

$ docker version
Client:
 Version:      1.9.1
 API version:  1.21
 Go version:   go1.4.2
 Git commit:   a34a1d5
 Built:        Fri Nov 20 13:12:04 UTC 2015
 OS/Arch:      linux/amd64
Cannot connect to the Docker daemon. Is the docker daemon running on this host?

$ sudo service docker start
start: Unknown job: docker

I am really confusing why I can find the path of docker from /etc/init and /etc/default， but I fail to start my docker deamon?

$ ls /etc/init |grep docker
docker.conf

$ ls /etc/default/ |grep docker
docker

I have tried some methos from Google and GitHub, but I failed.