OpenERP requires a user not to be a root to start. You should consider creating a special system user, that will be running that application and has rights to access Postgresql. Chekc out the guide at http://www.theopensourcerer.com/2012/12/how-to-install-openerp-7-0-on-ubuntu-12-04-lts/.

You have to install openerp under another user, such as openerp. You have to:

• install necessary packages
• create openerp user
• create directory where you will install openerp
• grant rwx permissions to the openerp user
• install openerp under the openerp user
• finally, run openerp with the openerp user