Hi, thanks for the feedback, I had already done the restart of the service before, both with Postgres and with Odoo itself.

The Web screen asks me to configure the following data

1- Master key

2-Database Name

3-Email

4-Password

5 - Phone Number

6- Language

7- Country

I fill in the data and I get the error I listed above.

/nano /etc/odoo/odoo.conf

About the settings. Continue with this one.

For the odoo.conf file

I have the following output

/[options]

; This is the password that allows database operations:

; admin_passwd = admin

db_host = False

db_port = False

db_user = odoo

db_password = senha_usuario_odoo

;addons_path = /usr/lib/python3/dist-packages/odoo/addons

default_productivity_apps = True

Inside the post I have this output for the command

\du

sudo -u postgres psql

psql (16.4 (Ubuntu 16.4-0ubuntu0.24.04.2))

Type "help" for help.

postgres=# \du

                             List of roles

Role name |                         Attributes

-----------+------------------------------------------------------------

odoo      | Superuser, Create DB

odooNS    | Create DB

postgres  | Superuser, Create role, Create DB, Replication, Bypass RLS

postgres=#

Hello Bruno, 

 First try to restart postgres services :

sudo service postgresql restart

otherwise Kindly review your odoo config file and check the odoo user password. 

If user not exit in case 

sudo -u postgres createuser -s username

sudo su postgres
psql
alter user username with password 'password';
\q
exit

Thanks.