Actualizar PostgreSQL 9.3 a 9.4
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Crear archivo: /etc/apt/sources.list.d/pgdg.list
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Agregar linea: deb http://apt.postgresql.org/pub/repos/apt/ trusty-pgdg main
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Ejecutar: wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | \sudo apt-key add - sudo apt-get update sudo apt-get install postgresql-9.4 export LC_CTYPE=en_US.UTF-8 export LC_ALL=en_US.UTF-8
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Comentar liea 352 en /usr/bin/pg_upgradecluster: "delete $ENV{'LC_ALL'}"
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Ejecutar: sudo pg_upgradecluster 9.3 main