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chruby

Install Ubuntu ruby prerequisites, otherwise you will be asked to use sudo even for a user install (though you can force ruby-install to skip dependencies):

sudo apt install build-essential libssl-dev

Install:

Check .zshrc is sourceing /usr/local/share/chruby/chruby.sh. Restart terminals.

Start installing: ruby-install 3.1 installs the latest stable version of 3.1.