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These were not sufficient because when I tried to enter the code, logged in and out to reload bash, then went to Users & Groups, I did not see "rvm" under Groups.
I did this, but once I got to "installing the GPG public keys", it gives me an error: "gpg: keyserver receive failed: Network is unreachable". When I googled this error, I see conversations about how "SKS keyservers are deprecated and going offline" and whatever solution they mention is too convoluted for me to understand. (https://askubuntu.com/questions/1372425/gpg-keyserver-receive-failed).
How do I download RVM? Please, any help would be very appreciated.
Try installing ruby 3.2.0. Once you get "ruby -v" showing 3.2.0 then you should be OK to do "gem install nsrr" and then run the "nsrr download <dataset>" commands.