/usr/lib/petscdir/3.7.5/x86_64-linux-gnu-real-debug/share/petsc/datafiles/meshes/doublet-tet.msh is in libpetsc3.7.5-dbg 3.7.5+dfsg1-4+b1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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