/usr/ is in ruby-url-safe-base64 0.2.2-1.
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/url_safe_base64/
/usr/lib/ruby/vendor_ruby/url_safe_base64/version.rb
/usr/lib/ruby/vendor_ruby/url_safe_base64.rb
/usr/share/
/usr/share/doc/
/usr/share/doc/ruby-url-safe-base64/
/usr/share/doc/ruby-url-safe-base64/README.md
/usr/share/doc/ruby-url-safe-base64/changelog.Debian.gz
/usr/share/doc/ruby-url-safe-base64/copyright
/usr/share/rubygems-integration/
/usr/share/rubygems-integration/all/
/usr/share/rubygems-integration/all/specifications/
/usr/share/rubygems-integration/all/specifications/url_safe_base64-0.2.2.gemspec