/usr/ is in liquidsoap-mode 1.1.1-7.2ubuntu1.
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/install/
/usr/lib/emacsen-common/packages/install/liquidsoap-mode
/usr/lib/emacsen-common/packages/remove/
/usr/lib/emacsen-common/packages/remove/liquidsoap-mode
/usr/share/
/usr/share/doc/
/usr/share/doc/liquidsoap-mode/
/usr/share/doc/liquidsoap-mode/README
/usr/share/doc/liquidsoap-mode/changelog.Debian.gz
/usr/share/doc/liquidsoap-mode/copyright
/usr/share/emacs/
/usr/share/emacs/site-lisp/
/usr/share/emacs/site-lisp/liquidsoap-mode/
/usr/share/emacs/site-lisp/liquidsoap-mode/liquidsoap-mode.el