ruby

/usr/bin/gem:23: uninitialized constant Gem::GemRunner (NameError)

If you chanced upon this message running gem command while trying to upgrade rubygems, you can get around it by typing:

    $ RUBYLIB="/usr/lib/ruby/vendor_ruby/1.8/" ruby /usr/bin/gem

From here, you can upgrade rubygems:

    $ RUBYLIB="/usr/lib/ruby/vendor_ruby/1.8/" ruby /usr/bin/gem install rubygems-update
    $ RUBYLIB="/usr/lib/ruby/vendor_ruby/1.8/" ruby /usr/bin/gem update --system
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