Hello

I am trying to install Tryton client and server on Ubuntu; but not 
succeeding; don't know why error 2 is coming wheneer I try to connect/run 
Tryton. Here is all what I done up till now to install and configure Tryton:

sudo apt-get install tryton-client
sudo apt-get install tryton-server tryton-modules-all

opened  /usr/share/doc/tryton-server/README.Debian dile and followed its 
instructions as follow:

0. sudo /etc/init.d/postgresql* restart            #Worked
1. sudo su - postgres -c "createuser --createdb --no-createrole 
--no-superuser \
       --pwprompt tryton"                           #Worked

2. Adjust /etc/trytond.conf to reflect the setup of your system and use the
     database user and password from step 1 for db_user and db_password.  
So here I opened /etc/trytond.conf file and replace
 #db_user = False
#db_password = False
to
#db_user = tryton
#db_password = tryton

3./etc/init.d/tryton-server restart # Here getting* error*, but start works 
for me instead restart

 following 4 and 5 are optional,  I tried to execute them too

4. sudo su - postgres -c "createdb --encoding=UNICODE --owner=tryton 
tryton"   #Worked
5. sudo /usr/bin/trytond -i all -d tryton    *# 
Error:*psycopg2.OperationalError: FATAL:  role "root" does not exist


Also provided read permissions to tryton configuration file: 
sudo chmod 777 /etc/trytond.conf 

In order to run Tryton I only type tryton in terminal--> tryton appliction 
start(I think its client one) then It ask for login where username and 
password does not work.
I have tried many combines of username and password: demo, demo; admin, 
admin; tryton, tryton;

Each time I get *[Errno -2] Name or service not known*

Please help me in configuring, why am getting this error?

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