Sorry for the confusion, it is a mistake in our documentation (thanks for reporting it, we will try to fix it ASAP).
You should run the previous command as super-user, so you must add
sudo before the command:
sudo chown -R daemon:daemon addons/MODULE-FOLDER-NAME
Apart from that, I followed the guide and I have been able to install modules without any problem.
I hope this information is useful for you. If you have any other question, please do not hesitate to let us know.
Carlos R. Hernández
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