Collabora docker does not start

I try to install Collabora on Ubuntu 16.04. But with installation of docker I get a fault.
For the installation of docker I did this:
sudo apt install docker.io
sudo mkdir /etc/systemd/system/docker.service.d
sudo nano /etc/systemd/system/docker.service.d/DeviceMapper.conf
Paste the following text into the file:
[Service]
ExecStart=
ExecStart=/usr/bin/dockerd --storage-driver=devicemapper -H fd://

sudo systemctl daemon-reload
sudo systemctl restart docker

And then I get this fault:
Jun 11 11:59:09 Nextcloud systemd[1]: Starting Docker Application Container Engine…
Jun 11 11:59:09 Nextcloud dockerd[12541]: time=“2017-06-11T11:59:09.744550196+02:00” level=info msg="libcontainerd: new containerd process, pid: 12547"
Jun 11 11:59:10 Nextcloud dockerd[12541]: time=“2017-06-11T11:59:10.748125764+02:00” level=error msg="AppArmor enabled on system but the docker-default profile could not be loaded."
Jun 11 11:59:10 Nextcloud dockerd[12541]: time=“2017-06-11T11:59:10.749401674+02:00” level=fatal msg="Error starting daemon: error initializing graphdriver: driver not supported"
Jun 11 11:59:10 Nextcloud systemd[1]: docker.service: Main process exited, code=exited, status=1/FAILURE
Jun 11 11:59:10 Nextcloud systemd[1]: Failed to start Docker Application Container Engine.
Jun 11 11:59:10 Nextcloud systemd[1]: docker.service: Unit entered failed state.
Jun 11 11:59:10 Nextcloud systemd[1]: docker.service: Failed with result ‘exit-code’.

What can I do?