odoo 13: FATAL: role "odoo" does not exist

symptom:

# tail /var/log/odoo/odoo-server.log
...
    conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
psycopg2.OperationalError: FATAL:  role "odoo" does not exist - - -

Solution:

1. su as postgres user in your Debian

# su - postgres

2. run psql

$ psql
psql (11.7 (Debian 11.7-0+deb10u1))
Type "help" for help.

3. create role odoo to connect and exit

postgres=# create role odoo login createdb;
CREATE ROLE
postgres=# \q