This tutorial is about setting up environment for RubyOnRails on Ubuntu 14.04.

First of all, update & upgrade your system:

Copysudo apt-get update

^
sudo apt-get upgrade
^

Install git and curl:

Copysudo apt-get install curl

^
sudo apt-get install git-core
^

Configure git:

Copygit config --global user.name "Your Name"

^
git config --global user.email email@example.com
^

Install RVM:

Copycurl -sSL https://get.rvm.io | bash -s stable

^
source ~/.rvm/scripts/rvm
^
Test RVM installation correctness:

Copytype rvm | head -1 #should return something like this: rvm is a function

^

Install some dependencies:

Copysudo apt-get install build-essential bison openssl libreadline6 libreadline6-dev zlib1g

^
sudo apt-get install zlib1g-dev libssl-dev libyaml-dev python-software-properties
^
sudo apt-get install libxml2-dev libxslt-dev libcurl4-openssl-dev autoconf
^
sudo apt-get install libsqlite3-0 libsqlite3-dev sqlite3 #if you plan to use Litesql for RoR application
^

If you see messages like this: perl: warning: Setting locale failed. throuth the installation process, then you must configure your locales.

If you plan to use Postgresql, perform this steps.

Install ruby:

1. select ruby version you want to install:
   ^
   rvm list known
   ^
   you should see:
   ^

   MRI Rubies

   [ruby-]1.8.6[-p420]
   [ruby-]1.8.7[-head] # security released on head
   [ruby-]1.9.1[-p431]
   [ruby-]1.9.2[-p330]
   [ruby-]1.9.3[-p547]
   [ruby-]2.0.0-p481
   [ruby-]2.0.0[-p576]
   [ruby-]2.1.2
   [ruby-]2.1[.3]
   [ruby-]2.1-head
   ruby-head

   GoRuby

   goruby

   Topaz

   topaz

   TheCodeShop - MRI experimental patches

   tcs

   jamesgolick - All around gangster

   jamesgolick

   Minimalistic ruby implementation - ISO 30170:2012

   mruby[-head]

   JRuby

   jruby-1.6.8
   jruby[-1.7.15]
   jruby-head

   Rubinius

   rbx-1.3.3
   rbx-2.0.0
   rbx-2.1.1
   rbx[-2.2.10]
   rbx-head

   Ruby Enterprise Edition

   ree-1.8.6
   ree[-1.8.7][-2012.02]

   Kiji

   kiji

   MagLev

   maglev[-head]
   maglev-1.0.0

   Mac OS X Snow Leopard Or Newer

   macruby-0.10
   macruby-0.11
   macruby[-0.12]
   macruby-nightly
   macruby-head

   Opal

   opal

   IronRuby

   ironruby[-1.1.3]
   ironruby-head
   ^

To install ruby 2.1.2, for example, type the following:

^
rvm install 2.1.2

If you don't want to install documentation for gems you'll be installing, add in ~/.gemrc file:
^
gem: --no-document
^