Postgres default port changed from 5432 to 5433

I had the same issue. Fixed by adding line with sed.

dist: xenial
group: edge

before_install:
  - sudo apt-get update
  - sudo apt-get --yes remove postgresql\*
  - sudo apt-get install -y postgresql-11 postgresql-client-11
  - sudo sed -i 's/port = 5433/port = 5432/' /etc/postgresql/11/main/postgresql.conf
  - sudo cp /etc/postgresql/{9.6,11}/main/pg_hba.conf
  - sudo service postgresql restart 11
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