/usr/ is in elpa-undo-tree 0.6.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/doc/elpa-undo-tree/
/usr/lib/
/usr/lib/emacsen-common/
/usr/lib/emacsen-common/packages/
/usr/lib/emacsen-common/packages/compat/
/usr/lib/emacsen-common/packages/compat/elpa-undo-tree
/usr/lib/emacsen-common/packages/install/
/usr/lib/emacsen-common/packages/install/elpa-undo-tree
/usr/lib/emacsen-common/packages/remove/
/usr/lib/emacsen-common/packages/remove/elpa-undo-tree
/usr/share/
/usr/share/doc/
/usr/share/doc/elpa-undo-tree/changelog.Debian.gz
/usr/share/doc/elpa-undo-tree/copyright
/usr/share/emacs/
/usr/share/emacs/site-lisp/
/usr/share/emacs/site-lisp/elpa-src/
/usr/share/emacs/site-lisp/elpa-src/undo-tree-0.6.4/
/usr/share/emacs/site-lisp/elpa-src/undo-tree-0.6.4/undo-tree-autoloads.el
/usr/share/emacs/site-lisp/elpa-src/undo-tree-0.6.4/undo-tree-pkg.el
/usr/share/emacs/site-lisp/elpa-src/undo-tree-0.6.4/undo-tree.el