I have just installed PostgreSQL on my machine.

psql --version psql returns (PostgreSQL) 16.2 (Ubuntu 16.2-1.pgdg22.04+1)

I’m trying to create a database but this error is prompted:

createdb: error: connection to server on socket "/var/run/postgresql/.s.PGSQL.5432" failed: FATAL:  role "***" does not exist

I’ve checked for postgresql.service and it is active.
I have also ran this postgres=# CREATE ROLE *** but I still get the error.