odoo - 9 how to install custom module in odoo 9
To install a new module in Odoo you have to :

Take a acces right to your new module : chmod -R 755 custom_module
In admin user activate external carctirstique
restart the service service odoo restart
Update module list
I have installed odoo - 9 in my local , I cannot able to see my custom module in update module list. I have activated "Developer Mode" even though it is not appearing in my module list. I also updated the module list, Can anybody guide me to install "Custom Module"  .