/usr/ is in ruby-net-ssh-gateway 2.0.0-1.
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/net/
/usr/lib/ruby/vendor_ruby/net/ssh/
/usr/lib/ruby/vendor_ruby/net/ssh/gateway/
/usr/lib/ruby/vendor_ruby/net/ssh/gateway/version.rb
/usr/lib/ruby/vendor_ruby/net/ssh/gateway.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-net-ssh-gateway/
/usr/share/doc/ruby-net-ssh-gateway/README.md
/usr/share/doc/ruby-net-ssh-gateway/changelog.Debian.gz
/usr/share/doc/ruby-net-ssh-gateway/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/net-ssh-gateway-2.0.0.gemspec