Here are the docs to install nokogiri https://nokogiri.org/tutorials/installing_nokogiri.html, there is a note for rvm:
Note for RVM users: you may require libgmp, consider running sudo apt-get install libgmp-dev.
Remove ruby with rvm https://rvm.io/rubies/removing
rvm remove 2.6.0
Install
Ruby
rvm install 2.6.0
Rails
gem install rails
For a existing project
bundle install
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