/usr/ is in libsuperlu-dev 5.2.1+dfsg1-3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/
/usr/include/superlu/
/usr/include/superlu/slu_Cnames.h
/usr/include/superlu/slu_cdefs.h
/usr/include/superlu/slu_dcomplex.h
/usr/include/superlu/slu_ddefs.h
/usr/include/superlu/slu_scomplex.h
/usr/include/superlu/slu_sdefs.h
/usr/include/superlu/slu_util.h
/usr/include/superlu/slu_zdefs.h
/usr/include/superlu/superlu_enum_consts.h
/usr/include/superlu/supermatrix.h
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/share/
/usr/share/doc/
/usr/share/doc/libsuperlu-dev/
/usr/share/doc/libsuperlu-dev/copyright
/usr/lib/x86_64-linux-gnu/libsuperlu.so
/usr/share/doc/libsuperlu-dev/changelog.Debian.gz