/usr/ is in octave-symbolic 1.1.0-3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/x86_64-linux-gnu/
/usr/lib/x86_64-linux-gnu/octave/
/usr/lib/x86_64-linux-gnu/octave/packages/
/usr/lib/x86_64-linux-gnu/octave/packages/symbolic-1.1.0/
/usr/lib/x86_64-linux-gnu/octave/packages/symbolic-1.1.0/x86_64-pc-linux-gnu-api-v49+/
/usr/lib/x86_64-linux-gnu/octave/packages/symbolic-1.1.0/x86_64-pc-linux-gnu-api-v49+/PKG_ADD
/usr/lib/x86_64-linux-gnu/octave/packages/symbolic-1.1.0/x86_64-pc-linux-gnu-api-v49+/symbols.oct
/usr/share/
/usr/share/doc/
/usr/share/doc/octave-symbolic/
/usr/share/doc/octave-symbolic/changelog.Debian.gz
/usr/share/doc/octave-symbolic/copyright
/usr/share/doc/octave-symbolic/symbolic.html
/usr/share/octave/
/usr/share/octave/packages/
/usr/share/octave/packages/symbolic-1.1.0/
/usr/share/octave/packages/symbolic-1.1.0/splot.m
/usr/share/octave/packages/symbolic-1.1.0/symfsolve.m
/usr/share/octave/packages/symbolic-1.1.0/findsym.m
/usr/share/octave/packages/symbolic-1.1.0/packinfo/
/usr/share/octave/packages/symbolic-1.1.0/packinfo/.autoload
/usr/share/octave/packages/symbolic-1.1.0/packinfo/INDEX
/usr/share/octave/packages/symbolic-1.1.0/packinfo/DESCRIPTION
/usr/share/octave/packages/symbolic-1.1.0/poly2sym.m
/usr/share/octave/packages/symbolic-1.1.0/doc-cache
/usr/share/octave/packages/symbolic-1.1.0/sym2poly.m