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/usr/include/deal.II/base/std_cxx1x/tuple.h is in libdeal.ii-dev 8.4.2-2+b1.

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The actual contents of the file can be viewed below.

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// ---------------------------------------------------------------------
//
// Copyright (C) 2014 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, redistribute
// it, and/or modify it under the terms of the GNU Lesser General
// Public License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------

// this file is deprecated. simply include the one we use now
#include "../std_cxx11/tuple.h"

// then allow using the old namespace name instead of the new one
DEAL_II_NAMESPACE_OPEN
namespace std_cxx1x = std_cxx11;
DEAL_II_NAMESPACE_CLOSE