/usr/include/trilinos/Thyra_XpetraLinearOp.hpp is in libtrilinos-muelu-dev 12.12.1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | #include "Thyra_XpetraLinearOp_decl.hpp"
#include "Thyra_XpetraLinearOp_def.hpp"
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