Ruby Environment Manager (RVM) is a tool that will allow you to download and install multiple versions of Ruby, one of the programming languages that we teach at Flatiron School. Installing RVM for Ubuntu is the first step in installing Ruby on your Ubuntu operating system.

1. Open the "Ubuntu" application using the "Start" menu
2. Type sudo apt-get install software-properties-common and press <Enter>
3. You may be asked to enter your Ubuntu terminal password
4. Type sudo apt-add-repository -y ppa:rael-gc/rvm and press <Enter>
5. Type sudo apt-get update and press <Enter>
6. Type sudo apt-get install rvm and press <Enter> (Note: if you are asked "Do you want to continue [Y/n]", type "Y" and press <Enter>)
7. Type sudo usermod -a -G rvm $USER and press <Enter>
8. Close the "Ubuntu" application
9. Open the "Ubuntu" application using the "Start" menu
10. Type rvm and press <Enter>

If you see a long message ending in "For additional documentation, please visit https://rvm.io", continue below. If rvm is not found, consult the troubleshooting steps in the Verify and Troubleshoot your WSL2 Environment Setup lesson later on in this module.

For our Ruby labs and lessons, we recommend that students use Ruby version 2.7.4 on Ubuntu. If Ruby Environment Manager (RVM) has been successfully installed, you can quickly install Ruby with a couple of commands.

1. Open the "Ubuntu" application using the "Start" menu
2. If the "Ubuntu" application is still open from the last step, close and re-open to prevent errors with running the next command.
3. Type rvm install 2.7.4 --default and press <Enter>
4. Enter your Ubuntu password if prompted
5. Type rvm list and press <Enter>

If you see a message starting with =* ruby-2.7.4, continue below.

Note: If you see that Ruby 2.7.4 is installed, but does not display =* before it, close and reopen the "Ubuntu" application, then run rvm use 2.7.4 --default.

If you encounter issues installing a version of Ruby via RVM, try the following in Ubuntu:

• Run rvm group add rvm $USER
• Close Ubuntu and reopen
• Run rvm fix-permissions

After running the last command, try installing Ruby again with rvm install 2.7.4 --default

If you are continuing to have issues installing RVM, try running the following:

$ sudo usermod -a -G rvm $USER

After running, try installing Ruby again.

Ruby Gems are small programs written in Ruby that help you to code more easily in Ruby. The gems you will install today include: Bundler, which allows you to keep track of which gems your projects need to work, and Pry, which allows you to pause your Ruby code when it runs and inspect it.

1. Open the "Ubuntu" application using the "Start" menu
2. Type gem update --system and press <Enter>
3. Type gem install bundler and press <Enter>
4. Type gem install pry and press <Enter>
5. Type gem list and press <Enter>

If you are able to complete each step without any issues and see pry and bundler listed in the output from running gem list, continue to the next lesson, Configuring Git and GitHub on WSL2.