can it be that the installation description given here:
is not totally consistent with/for systemd?
At this point:
'9. Configure the Docker daemon options. '
But: the file itself tells
'# THIS FILE DOES NOT APPLY TO SYSTEMD'
In the other steps yout take systemd into account.
The starting point to my consideration was that
' the command returns Docker Root Dir: /mnt/data/docker'
So I am stuck here with the usual troubleshooting.
Would you mind to update this step for systemd too?
Still new at docker and it would save much time for all :-).
By the way - in case it helps also others - a second issue.
'sudo service docker restart'
did not go well. A:
'sudo rm /var/lib/docker/network/files/local-kv.db'
prio to this solved this.