When I was installing an app who used PostGreSQL I got this error : DataError: encoding « UTF8 » does not match locale « en_US » DETAIL: The chosen LC_CTYPE setting requires encoding « LATIN1 ». Here is the solution : /etc/init.d/postgresql-9.3 stop pg_dropcluster –stop 9.3 main pg_createcluster –locale en_US.UTF-8 –start 9.3 main /etc/init.d/postgresql-9.3 start