Hello,

When i go and want to create a root user in Postgres i get this..
sudo createuser -U postgres -P

createuser: could not connect to database postgres: could not connect to server: No such file or directory
Is the server running locally and accepting
connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

And when i try to create a database it says
db_create tester

createdb: could not connect to database postgres: FATAL: Ident authentication failed for user "root"
psql: FATAL: Ident authentication failed for user "root"

What user are you trying to do that with? If not already, su to postgres:
su - postgres

From here run your commands.

When i switch to user postgres and run the command db_create tester
I get
createdb: could not connect to database postgres: FATAL: role "postgres" does not exist
psql: FATAL: database "tester" does not exist[*] Database creation complete (check for errors)

What do you get when you run a plain

psql

Is postgres (which version, btw, on which of your listed distros?) actually
running on that machine?
suggests it may not be...