Ubuntu - install Ruby Gems - /usr/lib/ruby/vendor_ruby/rubygems/defaults/operating_system.rb:50:in `': (NameError)

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Trying to install Ruby Gems on Ubuntu I use:

sudo apt-get install ruby-full
tar xfz rubygems-3.1.4.tgz
cd rubygems-3.1.4
ruby setup.rb

and g