Error When I try to "docker build --tag=submission ."

Hello
I just downloaded the Dockerfile
and following submission.md
I didn’t change anything in Dockerfile
if I sent docker build --tag=submission .
and here is the message

Sending build context to Docker daemon 145.8MB
Step 1/20 : FROM nvidia/cuda:9.0-cudnn7-runtime-ubuntu16.04
—> 890b7032cec3
Step 2/20 : RUN apt-get clean && apt-get update && apt-get install -y locales
—> Using cache
—> bff91e1674c0
Step 3/20 : RUN echo “en_US.UTF-8 UTF-8” > /etc/locale.gen && locale-gen
—> Using cache
—> 3c6debc21682
Step 4/20 : ENV LC_ALL en_US.UTF-8
—> Using cache
—> 430a81a82c6d
Step 5/20 : ENV LANG en_US.UTF-8
—> Using cache
—> efae0de7b012
Step 6/20 : ENV LANGUAGE en_US.UTF-8
—> Using cache
—> 6f89cac9db81
Step 7/20 : ENV SHELL /bin/bash
—> Using cache
—> b2bfcff2b2b6
Step 8/20 : RUN apt-get update && apt-get install -y curl bzip2 xvfb ffmpeg git libxrender1
—> Using cache
—> 7fe8cafc0162
Step 9/20 : WORKDIR /aaio
—> Using cache
—> 517669f56573
Step 10/20 : RUN curl -o ~/miniconda.sh -O https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh && chmod +x ~/miniconda.sh && ~/miniconda.sh -b -p /opt/conda && rm ~/miniconda.sh && /opt/conda/bin/conda clean -ya && /opt/conda/bin/conda create -n python36 python=3.6 numpy
—> Running in 4abac50d551b
% Total % Received % Xferd Average Speed Time Time Time Current
> Dload Upload Total Spent Left Speed
> 0 0 0 0 0 0 0 0 --:–:-- --:–:-- --:–:-- 0
> /bin/sh: 1: /opt/conda/bin/conda: not found
The command ‘/bin/sh -c curl -o ~/miniconda.sh -O https://repo.continuum.io/miniconda/Miniconda3-latest-Linux-x86_64.sh && chmod +x ~/miniconda.sh && ~/miniconda.sh -b -p /opt/conda && rm ~/miniconda.sh && /opt/conda/bin/conda clean -ya && /opt/conda/bin/conda create -n python36 python=3.6 numpy’ returned a non-zero code: 127

Can you tell me why?
Thank you very much.