[DRE-maint] Bug#830931: Gem::LoadError: Could not find 'ruby2ruby' (>= 0) among 13 total gem(s)

[Andreas Beckmann]

Followup-For: Bug #830931

Similar problems in jessie:

GEM_PATH= ruby -e 'gem "ruby2ruby"'
/usr/lib/ruby/2.1.0/rubygems/dependency.rb:298:in `to_specs': Could not find 'ruby2ruby' (>= 0) among 8 total gem(s) (Gem::LoadError)
        from /usr/lib/ruby/2.1.0/rubygems/dependency.rb:309:in `to_spec'
        from /usr/lib/ruby/2.1.0/rubygems/core_ext/kernel_gem.rb:53:in `gem'
        from -e:1:in `<main>'