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Ruby version missing in rbenv list

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On Ubuntu, you'll need to use the appropriate package manager (apt) to install dependencies and manage packages.


Here's how you can install Ruby using `rbenv` on Ubuntu:


1. **Install Dependencies**: Run the following command to install necessary dependencies for building Ruby:

    $ sudo apt update

    $ sudo apt install -y git curl libssl-dev libreadline-dev zlib1g-dev autoconf bison build-essential libyaml-dev libreadline-dev libncurses5-dev libffi-dev libgdbm-dev


2. **Install rbenv**: If you haven't already installed `rbenv`, you can do so by cloning the rbenv repository into the `~/.rbenv` directory:

   $ git clone https://github.com/rbenv/rbenv.git ~/.rbenv


    Then add `rbenv` to your PATH by running:

    $ echo 'export PATH="$HOME/.rbenv/bin:$PATH"' >> ~/.bashrc

    $ echo 'eval "$(rbenv init -)"' >> ~/.bashrc

    $  source ~/.bashrc


3. **Install ruby-build**: Similarly, you can install the `ruby-build` plugin, which provides the `rbenv install` command:

    $ git clone https://github.com/rbenv/ruby-build.git ~/.rbenv/plugins/ruby-build


4. **List Available Ruby Versions**: After setting up `rbenv` and `ruby-build`, you can list available Ruby versions:

    $ rbenv install --list


    Choose the desired Ruby version from the list and proceed with installation.


5. **Install Ruby**: Once you've chosen a Ruby version from the list, you can install it using `rbenv install`:

    $ rbenv install <ruby_version>


    Replace `<ruby_version>` with the version you want to install.


6. **Set Global Ruby Version**: After installing Ruby, you might want to set it as the global version:

    $  rbenv global <ruby_version>


    This will make the specified Ruby version the default version for your user.


Following these steps should allow you to install Ruby using `rbenv` on Ubuntu.

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