Quite old topic but for those looking for it, you need to change the owner of the the directory, and not the permissions: $ chown -R postgres /root/pgdata

I also have a similar problem, i was trying to get python' s psycopg2 to work on omega2+ but i cant seem to get pg_config for the omega installed, i also have opened a ticket ~1.5 months ago #7929 but still no reply/news from onion side