Nope.
With HA Supervised installed but not following ADR0012 / ADR0014 be prepared to run into that “Unhealthy” and “Unsupported” states with your HA installation.
Maybe. But not as that unpriviledged user you are supposed to go from here but you continued directly as the root user as your edited/non-edited log snippets show.
Anyway, you can try the following.
Firstly disable ModemManager from starting after reboots:
sudo systemctl status ModemManager
If modem manager is running stop and disable it:
sudo systemctl stop ModemManager
sudo systemctl disable ModemManager
Now make sure the latest NetworkManager is installed:
sudo dpkg -s network-manager
The output should show:
Package: network-manager
Status: install ok installed
If not, install NetworkManager:
sudo apt install network-manager
Now reboot the host:
sudo systemctl reboot
To prevent /etc/resolv.conf is getting overwritten with every reboot do the following:
Using the CLI edit /etc/NetworkManager/NetworkManager.conf
Search for the [main] section in this file. It should look something like this:
[main]
dns=default
plugins=keyfile
autoconnect-retries-default=0
rc-manager=file
Now change dns=default to dns=none just after the [main] tag like this:
[main]
dns=none
plugins=keyfile
autoconnect-retries-default=0
rc-manager=file
Save the file and restart NetworkManager.service:
sudo systemctl restart NetworkManager.service
Edit /etc/resolv.conf and add the DNS-server(s) of your choice.
If you haven’t already screwed-up your installation you should be able to continue with:
sudo -i
curl -fsSL get.docker.com | sh
which should finally bring you to the next level.