/usr/ is in ruby-instance-storage 1.0.0-3.
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/instance_storage/
/usr/lib/ruby/vendor_ruby/instance_storage/version.rb
/usr/lib/ruby/vendor_ruby/instance_storage.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-instance-storage/
/usr/share/doc/ruby-instance-storage/README.md
/usr/share/doc/ruby-instance-storage/changelog.Debian.gz
/usr/share/doc/ruby-instance-storage/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/instance_storage-1.0.0.gemspec