postgresql - role "postgres" does not exist; cannot createuser -

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i on linux mint cinnamon 2.2.16.

during process of getting rails , running, having problems postgres. 

postgres@bl ~ $ psql --version psql (postgres-xc) 1.1 (based on postgresql) 9.2.4

i unable working under usual username, changed default user using

sudo su - postgres

i cannot work createuser.

postgres@bl ~ $ psql psql: fatal:  role "postgres" not exist  postgres@bl ~ $ createuser -s -u $user createuser: not connect database postgres: fatal:  role "postgres" not exist  postgres@bl ~ $ sudo -u postgres createuser newname sorry, user postgres not allowed execute '/usr/bin/createuser newname' postgres on bl.  postgres@bl ~ $ psql /usr/bin/psql postgres@bl ~ $ psql \l psql: fatal:  role "postgres" not exist

after thoroughly researching problem , tearing out more few hairs, decided variation of problem packaging/installation, similar problem noted here: unable create user postgres: role "postgres" not exists

i did complete uninstall, per below, , reinstalled without postgresql-xc

how thoroughly purge , reinstall postgresql on ubuntu?

the new install had expected behavior user "postgres" , able add myself superuser , create new databases. after post-installation finagling, rails seems running , playing nice postgres.


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