Ubuntu にPostgreSQLを用意する ref: http://qiita.com/items/5f40a6aed6b81521b8f7
$ psql book -c "SELECT '1'::cube;"
cube
------
(1)
(1 row)
psql book -c "CREATE EXTENSION tablefunc"
psql book -c "CREATE EXTENSION fuzzystrmatch"
psql book -c "CREATE EXTENSION pg_trgm"
psql book -c "CREATE EXTENSION cube"
psql book -c "CREATE EXTENSION dict_xsyn"
$ sudo su - postgres
$ createdb book
$ psql book -c "SELECT '1'::cube"
ERROR: type "cube" does not exist
LINE 1: SELECT '1'::cube;
$ sudo apt-get install postgres postgres-client psotgresql-contrib