/usr/lib/petscdir/3.7.7/x86_64-linux-gnu-real-debug/share/petsc/datafiles/meshes/doublet-tet.msh is in libpetsc3.7.7-dbg 3.7.7+dfsg1-2build5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | $MeshFormat
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|