报错：
The following packages have unmet dependencies:
nvidia-docker2 : Depends: docker-ce (= 5:18.09.0~3-0~ubuntu-xenial) but 18.06.0~ce~3-0~ubuntu is to be installed or
docker-ee (= 5:18.09.0~3-0~ubuntu-xenial) but it is not installable
E: Unable to correct problems, you have held broken packages.
解决方案：
$ sudo apt-get install docker-ce=18.03.1~ce-0~ubuntu
$ sudo apt-get install nvidia-docker2=2.0.3+docker18.03.1-1 nvidia-container-runtime=2.0.0+docker18.03.1-1
$ sudo systemctl daemon-reload
$ sudo systemctl restart docker
# Let's test
$ sudo docker run --runtime=nvidia --rm nvidia/cuda:9.0-base nvidia-smi