Good Morning

I've recently installed some git modules in my Odoo v8 installation. I installed the server in an Ubuntu server following the guide here https://www.odoo.com/documentation/8.0/setup/install.html

I would like to know how to start odoo server with the --update all option. Because I've tried to perform it any way but I can't make it work on root and postgres users. And provokes and error of "role [ubuntu-user] does not exist" when accessing from [ubuntu-user].

Thank you