/usr/ is in librd-html-ext-ruby1.8 0.1.4-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/1.8/
/usr/lib/ruby/1.8/rd/
/usr/lib/ruby/1.8/rd/head-filter.rb
/usr/lib/ruby/1.8/rd/rd2html-ext-lib.rb
/usr/lib/ruby/1.8/rd/rd2html-ext-opt.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/librd-html-ext-ruby1.8/
/usr/share/doc/librd-html-ext-ruby1.8/rd2html-ext.rd
/usr/share/doc/librd-html-ext-ruby1.8/README.Debian
/usr/share/doc/librd-html-ext-ruby1.8/copyright
/usr/share/doc/librd-html-ext-ruby1.8/examples/
/usr/share/doc/librd-html-ext-ruby1.8/examples/Makefile
/usr/share/doc/librd-html-ext-ruby1.8/examples/sample.html
/usr/share/doc/librd-html-ext-ruby1.8/examples/sample.rd
/usr/share/doc/librd-html-ext-ruby1.8/changelog.Debian.gz