/usr/ is in libtrilinos-amesos-dev 12.4.2-2.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/cmake/
/usr/lib/x86_64-linux-gnu/cmake/Amesos/
/usr/lib/x86_64-linux-gnu/cmake/Amesos/AmesosTargets.cmake
/usr/lib/x86_64-linux-gnu/cmake/Amesos/AmesosTargets-none.cmake
/usr/lib/x86_64-linux-gnu/cmake/Amesos/AmesosConfig.cmake
/usr/include/
/usr/include/trilinos/
/usr/include/trilinos/amesos_klu_version.h
/usr/include/trilinos/amesos_btf_decl.h
/usr/include/trilinos/amesos_amd.h
/usr/include/trilinos/amesos_colamd.h
/usr/include/trilinos/Amesos_ComponentBaseSolver.h
/usr/include/trilinos/amesos_amd_internal.h
/usr/include/trilinos/amesos_cholmod_core.h
/usr/include/trilinos/Amesos_Mumps.h
/usr/include/trilinos/Amesos_config.h
/usr/include/trilinos/Amesos_Klu.h
/usr/include/trilinos/Amesos_BaseSolver.h
/usr/include/trilinos/Amesos_Reordering.h
/usr/include/trilinos/Amesos_Support.h
/usr/include/trilinos/amesos_cholmod.h
/usr/include/trilinos/amesos_cholmod_io64.h
/usr/include/trilinos/Amesos_Time.h
/usr/include/trilinos/amesos_btf_internal.h
/usr/include/trilinos/amesos_klu_decl.h
/usr/include/trilinos/Amesos_Control.h
/usr/include/trilinos/amesos_klu_internal.h
/usr/include/trilinos/amesos_cholmod_check.h
/usr/include/trilinos/Amesos_Utils.h
/usr/include/trilinos/Makefile.export.Amesos
/usr/include/trilinos/Amesos_Status.h
/usr/include/trilinos/Amesos.h
/usr/include/trilinos/Amesos_Lapack.h
/usr/include/trilinos/Amesos_ConfigDefs.h
/usr/include/trilinos/Amesos_NoCopiable.h
/usr/include/trilinos/CrsMatrixTranspose.h
/usr/include/trilinos/Amesos_Superlu.h
/usr/include/trilinos/Amesos_Scaling.h
/usr/include/trilinos/amesos_cholmod_partition.h
/usr/include/trilinos/Amesos_TestRowMatrix.h
/usr/include/trilinos/amesos_UFconfig.h
/usr/include/trilinos/amesos_cholmod_internal.h
/usr/share/
/usr/share/doc/
/usr/share/doc/libtrilinos-amesos-dev/
/usr/share/doc/libtrilinos-amesos-dev/copyright
/usr/lib/x86_64-linux-gnu/libtrilinos_amesos.so
/usr/share/doc/libtrilinos-amesos-dev/changelog.Debian.gz