Can not run PostgreSQL after drop table

I've deleted database from PostgreSQL and after this I can do nothing. Here what i receive with createuser

$ createuser -D new_user
createuser: could not connect to database postgres: FATAL:  role "postgres" does not exist

And this when try to run psql

$ psql
psql: FATAL:  role "postgres" does not exist

I've tried above with root, postgres, custom users. Still same output

Also I searched for pg_hba.conf like this find / -name 'pg_hba.conf' and got this

/var/lib/postgres-xc/DN2/pg_hba.conf
/var/lib/postgres-xc/DN1/pg_hba.conf
/var/lib/postgres-xc/CN/pg_hba.conf
/etc/postgres-xc/coordinator/CN/pg_hba.conf
/etc/postgres-xc/datanode/DN2/pg_hba.conf
/etc/postgres-xc/datanode/DN1/pg_hba.conf
/etc/postgresql/9.3/main/pg_hba.conf

I've changed connection method to trustfor localhost and IPv4 in /etc/postgresql/9.3/main/pg_hba.conf.

What should I do get rid of this error?

Does connection method in other files above should be edited too?