/usr/share/ri/1.8/system/ERB/ is in ri1.8 1.8.7.352-2ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/ri/1.8/system/ERB/Compiler/
/usr/share/ri/1.8/system/ERB/Compiler/Buffer/
/usr/share/ri/1.8/system/ERB/Compiler/Buffer/cdesc-Buffer.yaml
/usr/share/ri/1.8/system/ERB/Compiler/ExplicitScanner/
/usr/share/ri/1.8/system/ERB/Compiler/ExplicitScanner/cdesc-ExplicitScanner.yaml
/usr/share/ri/1.8/system/ERB/Compiler/PercentLine/
/usr/share/ri/1.8/system/ERB/Compiler/PercentLine/cdesc-PercentLine.yaml
/usr/share/ri/1.8/system/ERB/Compiler/Scanner/
/usr/share/ri/1.8/system/ERB/Compiler/Scanner/cdesc-Scanner.yaml
/usr/share/ri/1.8/system/ERB/Compiler/SimpleScanner/
/usr/share/ri/1.8/system/ERB/Compiler/SimpleScanner/cdesc-SimpleScanner.yaml
/usr/share/ri/1.8/system/ERB/Compiler/SimpleScanner2/
/usr/share/ri/1.8/system/ERB/Compiler/SimpleScanner2/cdesc-SimpleScanner2.yaml
/usr/share/ri/1.8/system/ERB/Compiler/TrimScanner/
/usr/share/ri/1.8/system/ERB/Compiler/TrimScanner/cdesc-TrimScanner.yaml
/usr/share/ri/1.8/system/ERB/Compiler/cdesc-Compiler.yaml
/usr/share/ri/1.8/system/ERB/DefMethod/
/usr/share/ri/1.8/system/ERB/DefMethod/cdesc-DefMethod.yaml
/usr/share/ri/1.8/system/ERB/DefMethod/def_erb_method-i.yaml
/usr/share/ri/1.8/system/ERB/Util/
/usr/share/ri/1.8/system/ERB/Util/cdesc-Util.yaml
/usr/share/ri/1.8/system/ERB/Util/h-i.yaml
/usr/share/ri/1.8/system/ERB/Util/html_escape-i.yaml
/usr/share/ri/1.8/system/ERB/Util/u-i.yaml
/usr/share/ri/1.8/system/ERB/Util/url_encode-i.yaml
/usr/share/ri/1.8/system/ERB/cdesc-ERB.yaml
/usr/share/ri/1.8/system/ERB/def_class-i.yaml
/usr/share/ri/1.8/system/ERB/def_method-i.yaml
/usr/share/ri/1.8/system/ERB/def_module-i.yaml
/usr/share/ri/1.8/system/ERB/new-c.yaml
/usr/share/ri/1.8/system/ERB/result-i.yaml
/usr/share/ri/1.8/system/ERB/run-i.yaml
/usr/share/ri/1.8/system/ERB/set_eoutvar-i.yaml
/usr/share/ri/1.8/system/ERB/version-c.yaml