Installing ruby on rails (ruby version 1.9.3, rails version 3.2.2) on Ubuntu Lucid LTS 10.04

The post shows a step-by-step installation of the Ruby on Rails on Ubuntu 10.04 LTS.

1. install build essential, github and 

sudo apt-get install build-essential

2. install rvm (which includes ruby 1.9.3 and gem 1.8.19)

bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
source ~/.bashrc
rvm requirement -- install output required libraries by copy and paste the output text
rvm install 1.9.3  -- it takes a while

3. install rails

copy and paste the text below at the end of ~/.bashrc: 
[[-s "$HOME/.rvm/scripts/rvm"]] && . "$HOME/.rvm/scripts/rvm" 

source $HOME/.bashrc

check the successful installation of rvm:

type rvm | head -1

output should be 'rvm is a function'

gem install rails --include-dependencies

Congratulations! You have successfully installed Ruby on Rails!