Installing Ruby on Rails on Linux Environment the Perfect way 

sudo apt-get update
sudo apt-get upgrade
sudo apt-get install ruby1.9.2-full build-essential git-core
wget http://production.cf.rubygems.org/rubygems/rubygems-1.8.15.tgz
tar -zxvf rubygems-1.8.15.tgz
cd rubygems-1.8.15
sudo ruby setup.rb
sudo gem update --system
sudo gem install rubygems-update
sudo update_rubygems
sudo gem install rails
sudo apt-get install libsqlite3-dev
sudo gem install sqlite3
sudo apt-get install nodejs
sudo apt-get install mysql-server mysql-client
sudo apt-get install libmysql-ruby libmysqlclient-dev
sudo gem install mysql
Just copy and paste the above codes line by line on Linux terminal.