>From 'man createuser':
createuser creates a new PostgreSQL user (or more precisely, a
role). Only superusers and users with
CREATEROLE privilege can create new users, so createuser must be
invoked by someone who can connect as a
superuser or a user with CREATEROLE privilege.
When postgresql is installed, it also creates a user ‘postgres’ with role
‘postgres’. It also creates a system account with same name ‘postgres’.
So this is why 'createuser' should be run as 'postgres' user.
It is possible to connect to postgresql only as a database user AND through
an existing database.
During installation from the postgresql apt repository, postgresql only
creates the 'postgres' user and the 'postgres' database.
The 'psql' allow the current user to connect to the postgresql database
named after the user's name.
So, if the system user is 'dave' AND there is a 'dave' database it is
possible for 'dave' to connect to the 'dave' database with command 'psql'.
If 'dave' is also a database user but the database 'dave' was not created,
for dave to connect to postgresql it is necessary to specify an existing
database with:
$ psql -d postgres
Alternatively, it is possible for dave to connect to postgresql executing
the 'psql' command as the 'postgres' user with 'sudo':
$ sudo -u postgres psql
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