How to set Odoo 10 custom addons path?

Question

I'm trying to place 3rd party addons into a separate folder.
The relevant line of my .conf file is this:
addons_path = /opt/odoo/addons, /opt/odoo/custom-addons
If I place a 3rd party addon into the first listed folder, there's no problem, but it does not work for the second. Do I need some kind of chmod or chown for the folder? Restarting the odoo-server service doesn't help.
I setup my Odoo Community instance using this guide:  https://www.linode.com/docs/websites/cms/install-odoo-10-on-ubuntu

Ermin Trevisan · Accepted Answer

Your line in the .conf file is fine. Change the owner of the addons directory to odoo. Change the directory access rights to 755 and the files access rights to 644.
sudo chown -R root:odoo   /opt/odoo/ custom-addons
sudo find  /opt/odoo/ custom-addons -type f -exec chmod 644 {} \;
sudo find  /opt/odoo/ custom-addons -type d -exec chmod 755 {} \;

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