PostgreSQL FATAL: role "root" does not exist

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http://serverfault.com – Something quite weird is happening. I have been working on a Django project for awhile, and everything has been going fine, but yesterday I quit using wifi, and started using ethernet. And once I did this switch I have been getting the following OperationalErrors: FATAL: role "root" does not exist and: Error: psql: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/tmp/.s.PGSQL.5432"? I looked at the "Common PostgreSQL Errors and Solutions" document, but none of it is working for me. Has anyone r (HowTos)