Problem with GPU support on DCOS

[lmiroslaw]

Is this a request for help?:
YES

Is this a BUG REPORT or FEATURE REQUEST? (choose one):
BUG REPORT

Orchestrator and version (e.g. Kubernetes, DC/OS, Swarm) DCOS
Deployed with az acs create --orchestrator-type dcos --resource-group oss-dcos-cluster --name myDCOSCluster --generate-ssh-keys --agent-vm-size Standard_NC6 --agent-count 2

What happened:
cannot install docker.io that is mandatory for running nvidia-docker2.
sudo apt-get install docker.io

triggers the error

Setting up grub-pc (2.02~beta2-36ubuntu3.16) ...
debconf: unable to initialize frontend: Dialog
debconf: (Dialog frontend will not work on a dumb terminal, an emacs shell buffer, or without a controlling terminal.)
debconf: falling back to frontend: Readline
Generating grub configuration file ...
grub-probe: warning: disk does not exist, so falling back to partition device /dev/sda1.
grub-probe: warning: disk does not exist, so falling back to partition device /dev/sda1.
grub-probe: warning: disk does not exist, so falling back to partition device /dev/sda1.
grub-probe: error: disk `hostdisk//dev/sda1' not found.
dpkg: error processing package grub-pc (--configure):
subprocess installed post-installation script returned error exit status 1

What you expected to happen:
Smooth installation

How to reproduce it (as minimally and precisely as possible):
Execute Xenial installation procecure at:

https://github.com/NVIDIA/nvidia-docker