Install nvidia-docker 2.0 on Ubuntu 18.04

I needed to install nvidia-docker 2.0 to use Runwayml's local GPU.
Here are the commands I ran.

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$ curl -sL https://nvidia.github.io/nvidia-docker/gpgkey | sudo apt-key add -
$ distribution=$(. /etc/os-release;echo $ID$VERSION_ID)
$ curl -sL https://nvidia.github.io/nvidia-docker/$distribution/nvidia-docker.list | sudo tee /etc/apt/sources.list.d/nvidia-docker.list
$ sudo apt update
$ sudo apt install nvidia-docker2 -y
$ sudo pkill -SIGHUP dockerd
$ sudo docker run --runtime=nvidia --rm nvidia/cuda nvidia-smi

Probably you will see this.

7ddbc47eeb70: Pull complete
c1bbdc448b72: Pull complete
8c3b70e39044: Pull complete
45d437916d57: Pull complete
d8f1569ddae6: Pull complete
85386706b020: Pull complete
ee9b457b77d0: Pull complete
be4f3343ecd3: Pull complete
30b4effda4fd: Pull complete
Digest: sha256:31e2a1ca7b0e1f678fb1dd0c985b4223273f7c0f3dbde60053b371e2a1aee2cd
Status: Downloaded newer image for nvidia/cuda:latest
Sat Feb  8 03:11:46 2020      
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 440.33.01    Driver Version: 440.33.01    CUDA Version: 10.2     |
|-------------------------------+----------------------+----------------------+
| GPU  Name        Persistence-M| Bus-Id        Disp.A | Volatile Uncorr. ECC |
| Fan  Temp  Perf  Pwr:Usage/Cap|         Memory-Usage | GPU-Util  Compute M. |
|===============================+======================+======================|
|   0  GeForce GTX 1070    On   | 00000000:01:00.0  On |                  N/A |
| N/A   52C    P8     4W /  N/A |    349MiB /  8111MiB |      2%      Default |
+-------------------------------+----------------------+----------------------+

+-----------------------------------------------------------------------------+
| Processes:                                                       GPU Memory |
|  GPU       PID   Type   Process name                             Usage      |
|=============================================================================|
+-----------------------------------------------------------------------------+