This bug was fixed in the package postgresql-9.6 - 9.6.7-0ubuntu0.17.10

postgresql-9.6 (9.6.7-0ubuntu0.17.10) artful-security; urgency=medium

  * New upstream release (LP: #1747676)
    - Ensure that all temporary files made by pg_upgrade are non-world-readable
    - Change the behavior of contrib/cube's cube ~> int operator to make it
      compatible with KNN search.
      The meaning of the second argument (the dimension selector) has been
      changed to make it predictable which value is selected even when
      dealing with cubes of varying dimensionalities.
      This is an incompatible change, but since the point of the operator
      was to be used in KNN searches, it seems rather useless as-is.
      After installing this update, any expression indexes or materialized
      views using this operator will need to be reindexed/refreshed.
    - Details about other changes at full changelog:

 -- Christian Ehrhardt <>  Tue, 06 Feb
2018 15:20:19 +0100

** Changed in: postgresql-9.6 (Ubuntu Artful)
       Status: Triaged => Fix Released

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  New upstream microreleases 9.3.21, 9.5.11 and 9.6.7

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