Error Installing on NAS QNAP

Hi, I would migrate an from RaspberryPI3 to my NAS QNAP TS231P2.
I have executed these activities:

  1. install Ubuntu 18.04 as docker container of NAS
docker pull ubuntu:latest
docker run -it --name hassio --privileged ubuntu:latest bash
apt-get update 
apt-get -y install sudo
sudo apt-get -y install systemd

Result : OK

  1. install Docker CE inside above Ubuntu container
useradd -m docker 
echo "docker:docker" | chpasswd 
adduser docker sudo
sudo apt-get update
sudo apt-get install -y apt-transport-https ca-certificates curl gnupg-agent software-properties-common
curl -fsSL | sudo apt-key add -
sudo add-apt-repository  "deb [arch=armhf]  $(lsb_release -cs)  stable"
sudo apt-get update
sudo apt-get install -y docker-ce docker-ce-cli
sudo service docker start
sudo systemctl enable docker

Result : OK

  1. install Hass.IO
sudo -s
apt-get upgrade
apt-get update
apt-get install -y bash jq curl avahi-daemon dbus network-manager apparmor-utils
apt-get install -y apt-transport-https ca-certificates curl software-properties-common
curl -sL | bash -s -x -- -m arm -d /home/hassio/hassiocfg   

Result : System has not been booted with systemd as init system (PID 1). Can’t operate
after executing : systemctl start hassio-apparmor.service

I have spent 2 days for this, but I don’t know how to continue.
Any suggestion please ?

Thanks in advance

Did you give up on

I’ve got running on a Synology DiskStation NAS and it should be similar for qnap.

Have you tried LXC container?