/usr/share/emacs/site-lisp/ess/ is in ess 5.14-1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/emacs/site-lisp/ess/ess-arc-d.el
/usr/share/emacs/site-lisp/ess/ess-bugs-d.el
/usr/share/emacs/site-lisp/ess/ess-bugs-l.el
/usr/share/emacs/site-lisp/ess/ess-comp.el
/usr/share/emacs/site-lisp/ess/ess-compat.el
/usr/share/emacs/site-lisp/ess/ess-custom.el
/usr/share/emacs/site-lisp/ess/ess-dde.el
/usr/share/emacs/site-lisp/ess/ess-debug.el
/usr/share/emacs/site-lisp/ess/ess-eldoc.el
/usr/share/emacs/site-lisp/ess/ess-font-lock.el
/usr/share/emacs/site-lisp/ess/ess-help.el
/usr/share/emacs/site-lisp/ess/ess-inf.el
/usr/share/emacs/site-lisp/ess/ess-install.el
/usr/share/emacs/site-lisp/ess/ess-jags-d.el
/usr/share/emacs/site-lisp/ess/ess-lsp-l.el
/usr/share/emacs/site-lisp/ess/ess-menu.el
/usr/share/emacs/site-lisp/ess/ess-mode.el
/usr/share/emacs/site-lisp/ess/ess-mous.el
/usr/share/emacs/site-lisp/ess/ess-mouse.el
/usr/share/emacs/site-lisp/ess/ess-noweb.el
/usr/share/emacs/site-lisp/ess/ess-omg-d.el
/usr/share/emacs/site-lisp/ess/ess-omg-l.el
/usr/share/emacs/site-lisp/ess/ess-r-a.el
/usr/share/emacs/site-lisp/ess/ess-r-args.el
/usr/share/emacs/site-lisp/ess/ess-r-d.el
/usr/share/emacs/site-lisp/ess/ess-r-gui.el
/usr/share/emacs/site-lisp/ess/ess-rd.el
/usr/share/emacs/site-lisp/ess/ess-rdired.el
/usr/share/emacs/site-lisp/ess/ess-roxy.el
/usr/share/emacs/site-lisp/ess/ess-rutils.el
/usr/share/emacs/site-lisp/ess/ess-s-l.el
/usr/share/emacs/site-lisp/ess/ess-s3-d.el
/usr/share/emacs/site-lisp/ess/ess-s4-d.el
/usr/share/emacs/site-lisp/ess/ess-sas-a.el
/usr/share/emacs/site-lisp/ess/ess-sas-d.el
/usr/share/emacs/site-lisp/ess/ess-sas-l.el
/usr/share/emacs/site-lisp/ess/ess-send.el
/usr/share/emacs/site-lisp/ess/ess-send2.el
/usr/share/emacs/site-lisp/ess/ess-site.el
/usr/share/emacs/site-lisp/ess/ess-sp3-d.el
/usr/share/emacs/site-lisp/ess/ess-sp4-d.el
/usr/share/emacs/site-lisp/ess/ess-sp5-d.el
/usr/share/emacs/site-lisp/ess/ess-sp6-d.el
/usr/share/emacs/site-lisp/ess/ess-sp6w-d.el
/usr/share/emacs/site-lisp/ess/ess-sta-d.el
/usr/share/emacs/site-lisp/ess/ess-sta-l.el
/usr/share/emacs/site-lisp/ess/ess-swv.el
/usr/share/emacs/site-lisp/ess/ess-toolbar.el
/usr/share/emacs/site-lisp/ess/ess-trns.el
/usr/share/emacs/site-lisp/ess/ess-utils.el
/usr/share/emacs/site-lisp/ess/ess-vst-d.el
/usr/share/emacs/site-lisp/ess/ess-xls-d.el
/usr/share/emacs/site-lisp/ess/ess.el
/usr/share/emacs/site-lisp/ess/essd-els.el
/usr/share/emacs/site-lisp/ess/make-regexp.el
/usr/share/emacs/site-lisp/ess/mouseme.el
/usr/share/emacs/site-lisp/ess/msdos.el
/usr/share/emacs/site-lisp/ess/noweb-font-lock-mode.el
/usr/share/emacs/site-lisp/ess/noweb-mode.el