osboxes@osboxes:/usr/src/postgresql-9.1.4$ sudo service postgresql start
[sudo] password for osboxes:
 * Starting PostgreSQL 9.1 database server                                                              * The PostgreSQL server failed to start. Please check the log output:
2018-12-19 10:34:51 GMT FATAL:  "/home/osboxes/data914" is not a valid data directory
2018-12-19 10:34:51 GMT DETAIL:  File "/home/osboxes/data914/PG_VERSION" does not contain valid data.
2018-12-19 10:34:51 GMT HINT:  You might need to initdb.