Install Ubuntu ruby prerequisites, otherwise you will be asked to use sudo even for a user install though you can/may have to force ruby-install to skip dependencies with –no-install-deps:

• sudo apt install build-essential libssl-dev

Install:

• chruby
• ruby-install

Check .zshrc is sourceing /usr/local/share/chruby/chruby.sh and /usr/local/share/chruby/auto.sh for autoswitching. Restart terminals.

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

ruby-install heavily relies on hopping into sudo mid-install to satisfy dependencies.

I haven't been able to get this to install for a user without sudo access.

However, installing for a sudoer and then manually moving the .rubies/ruby-3.X.X directory to the non-sudoer user directory and sudo chown -R user.user /home/user/.rubies seems to work.

• Once the prereqs are installed, can more rubies be installed the vanilla way?