update ruby version
rvm list known
rvm install ruby@latest
ruby -v
## If it still shows you ruby 2.0., run rvm use ruby-X.X.X --default.update ruby version
rvm list known
rvm install ruby@latest
ruby -v
## If it still shows you ruby 2.0., run rvm use ruby-X.X.X --default.downgrade ruby version ubuntu
sudo apt-get update
sudo apt-get install git-core curl zlib1g-dev build-essential libssl-dev libreadline-dev libyaml-dev libsqlite3-dev sqlite3 libxml2-dev libxslt1-dev libcurl4-openssl-dev python-software-properties libffi-devCopyright © 2021 Codeinu
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