/usr/ is in elpa-notmuch 0.26-1ubuntu3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/emacsen-common/
/usr/lib/emacsen-common/packages/
/usr/lib/emacsen-common/packages/compat/
/usr/lib/emacsen-common/packages/compat/elpa-notmuch
/usr/lib/emacsen-common/packages/install/
/usr/lib/emacsen-common/packages/install/elpa-notmuch
/usr/lib/emacsen-common/packages/remove/
/usr/lib/emacsen-common/packages/remove/elpa-notmuch
/usr/share/
/usr/share/doc/
/usr/share/doc/elpa-notmuch/
/usr/share/doc/elpa-notmuch/NEWS.Debian.gz
/usr/share/doc/elpa-notmuch/changelog.Debian.gz
/usr/share/doc/elpa-notmuch/copyright
/usr/share/emacs/
/usr/share/emacs/site-lisp/
/usr/share/emacs/site-lisp/elpa-src/
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/coolj.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/make-deps.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-address.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-autoloads.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-company.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-compat.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-crypto.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-draft.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-hello.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-jump.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-lib.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-maildir-fcc.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-message.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-mua.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-parser.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-pkg.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-print.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-query.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-show.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-tag.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-tree.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-version.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch-wash.el
/usr/share/emacs/site-lisp/elpa-src/notmuch-0.26/notmuch.el