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 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 -E 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 source /etc/profile.d/rvm.sh and press <Enter>
8. Type curl -sSL https://raw.githubusercontent.com/flatiron-school/dotfiles/master/rvm-shell-script >> ~/.bashrc and press <Enter>
9. Close the "Ubuntu" application
10. Open the "Ubuntu" application using the "Start" menu
11. 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, check out 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 expect that students use Ruby version 2.6.1 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 "ruby-2.6.1" and press <Enter>
4. Type rvm list and press <Enter>

If you see a message starting with =* ruby-2.6.1, continue below.

Note: If you see that Ruby 2.6.1 is installed, but does not display =* before it, close and reopen the "Ubuntu" application, then run rvm use 2.6.1 --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 2.6.1 --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; Pry, which allows you to pause your code when it runs and inspect it; Nokogiri, which allows you to read and pick apart HTML pages; and Ruby on Rails, which allows you to easily create a web application with Ruby.

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 install nokogiri and press <Enter> (Note: this gem typically takes longer than the others to install)
6. Type gem install rails and press <Enter>
7. Type gem install learn-co and press <Enter>
8. Type gem list | wc -l and press <Enter>

If you are able to complete each step without any issues and you see an output of a number around or above 100 from the last command, continue to the next lesson, Installing Databases on WSL2.