/usr/ is in ruby-net-ssh-gateway 1.2.0-1.
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/share/
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/2.0/
/usr/share/rubygems-integration/2.0/specifications/
/usr/share/rubygems-integration/2.0/specifications/net-ssh-gateway-1.2.0.gemspec
/usr/share/rubygems-integration/1.9.1/
/usr/share/rubygems-integration/1.9.1/specifications/
/usr/share/rubygems-integration/1.9.1/specifications/net-ssh-gateway-1.2.0.gemspec
/usr/share/doc/
/usr/share/doc/ruby-net-ssh-gateway/
/usr/share/doc/ruby-net-ssh-gateway/copyright
/usr/share/doc/ruby-net-ssh-gateway/README.rdoc
/usr/share/doc/ruby-net-ssh-gateway/changelog.Debian.gz
/usr/lib/ruby/vendor_ruby/net/ssh/gateway.rb