Unable to update ruby file owned by OS

Question

I'm trying to update ruby on ubuntu using sudo gem update --system but keep getting the error:

Loading the rubygems/defaults/operating_system.rb file caused an error. This file is owned by your OS, not by rubygems upstream. Please find out which OS package this file belongs to and follow the guidelines from your OS to report the problem and ask for help. I tried

chown'ing the entire gems library but to no avail. What can I do?

Answer 1

This can happen if an old ruby version is created that .rb file. Usually it is located at

/usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb

Deleting it and trying to run

gem update --system

worked for me.