/usr/ is in ruby-subexec 0.2.3+gh-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/
/usr/lib/ruby/
/usr/lib/ruby/vendor_ruby/
/usr/lib/ruby/vendor_ruby/subexec.rb
/usr/share/
/usr/share/lintian/
/usr/share/lintian/overrides/
/usr/share/lintian/overrides/ruby-subexec
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/1.8/
/usr/share/rubygems-integration/1.8/specifications/
/usr/share/rubygems-integration/1.8/specifications/subexec-0.2.3.gemspec
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/subexec-0.2.3.gemspec
/usr/share/doc/
/usr/share/doc/ruby-subexec/
/usr/share/doc/ruby-subexec/copyright
/usr/share/doc/ruby-subexec/changelog.Debian.gz