Thank you, all of you, very much. I have now a working environment. I decided to install rvm with --rails and --autolibs=enable options, in order to avoid post installation dependency issues. I found information about the --autolibs=enable option at this link <https://blog.engineyard.com/2013/rvm-ruby-2-0>. I also updated Git as suggested by Laith Shadeed, because it seemed necessary. Configuring PostgreSQL for Rails might be my next step.
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