/usr/ is in courier-webadmin 0.78.0-2ubuntu2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/courier/webadmin/
/usr/lib/courier/courier/webmail/webadmin
/usr/share/
/usr/share/courier/
/usr/lib/
/usr/lib/courier/
/usr/lib/courier/courier/
/usr/lib/courier/courier/webmail/
/usr/share/courier/webadmin/admin-00machine.html
/usr/share/courier/webadmin/admin-00machine.pl
/usr/share/courier/webadmin/admin-10password.html
/usr/share/courier/webadmin/admin-10password.pl
/usr/share/courier/webadmin/admin-15mysql.html
/usr/share/courier/webadmin/admin-15mysql.pl
/usr/share/courier/webadmin/admin-15pgsql.html
/usr/share/courier/webadmin/admin-15pgsql.pl
/usr/share/courier/webadmin/admin-20aliases.html
/usr/share/courier/webadmin/admin-20aliases.pl
/usr/share/courier/webadmin/admin-cancel.pl
/usr/share/courier/webadmin/admin-main.html
/usr/share/courier/webadmin/admin-main.pl
/usr/share/courier/webadmin/admin-save.html
/usr/share/courier/webadmin/admin-save.pl
/usr/share/courier/webadmin/dumpenv.pl
/usr/share/courier/webadmin/login.html
/usr/share/courier/webadmin/notsupp.html
/usr/share/courier/webadmin/unsecure.html
/usr/share/courier/webadmin/webadmin.pl
/usr/share/courier/webadmin/webadmin.pm
/usr/share/doc/
/usr/share/doc/courier-webadmin/
/usr/share/doc/courier-webadmin/README.Debian
/usr/share/doc/courier-webadmin/copyright
/usr/share/doc/courier-webadmin/NEWS.Debian.gz
/usr/share/doc/courier-webadmin/changelog.Debian.gz