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The Plymouth service refuses to quit, so you can't see the logging.

For balenaSound its like 85% services, 10% logs, 5% the top section.
We could parse and compress the information on the services json object into a more condensed view.

Line 5-6 of run.sh shows the following command is attempted:

# try and set the hostname to 'balena'
curl -X -s PATCH --header "Content-Type:application/json" --data '{"network": {"hostname": "balena"}}' "$BALENA_SUPERVISOR_ADDRESS/v1/device/host-config?apikey=$BALENA_SUPERVISOR_API_KEY" > /dev/null

This doesn't work and instead gives the following error:

curl: (6) Could not resolve host: PATCH

The issue is caused by the "-s" option following the "-X". If the order of these arguments is swapped then the command would run successfully.

But why do you want to change the hostname to begin with?