How to install Rvm, Ruby, and Rails in Ubuntu 12.04

A concise guide to get Rails running locally.

1. Install package dependencies

sudo apt-get install zlib1g zlib1g-dev build-essential
sqlite3 libsqlite3-dev openssl libssl-dev curl git
libmagick++-dev libmagick++4

2. Install rvm from Github source

bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)

3. Reload terminal shell

source /home/ben/.rvm/scripts/rvm

4. Add rvm to bash

echo '[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # Load RVM function' >> ~/.bash_profile

5. Add any additional requirements specified by rvm

rvm requirements

copy / paste any Additional Dependencies: specified in the terminal output into sudo apt-get

6. Install ruby version to rvm

rvm install 1.9.3-p194

*Update rvm and Ruby version (useful to know)

rvm get stable
rvm list known

Troubleshooting
RVM is not a function, selecting rubies with 'rvm use ...' will not work.
Open your Terminal  and select Edit > Preferences > Run command as login shell (make sure it is selected)

7. Setup default ruby version in rvm

rvm use 1.9.3-p194 --default

8. Install rails

gem install rails

9. Install RSpec

gem install rspec

10. Install Bundler

gem install bundler

If you see ERROR: Gem bundler is not installed, run `gem install bundler` first. when running bundle change https://rubygems.org to http://rubygems.org in your Gemfile.