/usr/lib/petscdir/3.1/include/finclude/petscerror.h is in libpetsc3.1-dev 3.1.dfsg-11ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | !
! Include file for Fortran error codes
!
#include "finclude/petscerrordef.h"
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