This also affects libdune-grid-dev by breaking the `subsamplingvtktest`
test of the package. Steps to reproduce this locally:

1. Create a new dune module using `duneproject testvtk`, adding `dune-grid` as 
dependency.
2. Create subdirectory `dune/grid/io/file/test/` in `testvtk`
3. Copy the file `dune-grid/dune/grid/io/file/test/checkvtkfile.hh` from the 
dune-grid sources to `testvtk/dune/grid/io/file/test/`.
4. Overwrite file ´testvtk/src/testvtk.cc` by the test 
`dune-grid/dune/grid/io/file/test/subsamplingvtktest.cc` from the dune-grid 
sources.
5. Build the module using `dunecontrol all` and run 
`testvtk/build-cmake/src/testvtk`.

The same failure will probably show up when executing the tests while
rebuilding the package `libdune-grid-dev`.

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https://bugs.launchpad.net/bugs/2058415

Title:
  Reading binary data in paraview broken by libexpat1 update

Status in dune-grid package in Ubuntu:
  New
Status in expat package in Ubuntu:
  Confirmed
Status in paraview package in Ubuntu:
  Confirmed

Bug description:
  The recent update of libexpat1 to version 2.5.0-2ubuntu0.1 broke Paraview. 
  In particular reading vtu files containing binary data fails since this 
update. When trying to open files that worked fine before, Paraview now reports 
a parsing error like this one:

  ERROR: In vtkXMLParser.cxx, line 376
  vtkXMLDataParser (0x5b0ac36fc970): Error parsing XML in stream at line 21, 
column 0, byte index 1036: not well-formed (invalid token)

  ERROR: In vtkXMLReader.cxx, line 521
  vtkXMLUnstructuredGridReader (0x5b0ac3d3b670): Error parsing input file.  
ReadXMLInformation aborting.

  The problem disappears when reverting libexpat1 to version 2.5.0-2.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/dune-grid/+bug/2058415/+subscriptions


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