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Core Environment

sudo apt-get install build-essential mysql-server mysql-client subversion
sudo apt-get install ruby libzlib-ruby rdoc eruby irb libsvn-ruby ri libmysql-ruby libdbd-mysql-ruby
sudo apt-get install imagemagick libmagick9-dev librmagick-ruby graphviz ruby1.8-dev libmysqlclient15-dev 
sudo apt-get install openssl htmldoc gnuplot rake zip
sudo apt-get install sqlite3 libsqlite3-dev mongrel

Installing Rubygems

It is better to use the latest version of ruby gems therefore:

# cd $HOME
# wget http://rubyforge.org/frs/download.php/38646/rubygems-1.2.0.tgz
# tar xvzf rubygems-1.2.0.tgz && cd rubygems-1.2.0
# sudo ruby setup.rb

Download the latest version of rubygems available (currently 1.2.0).

If Ubuntu complains that the ‘gem’ command is not found, you may have to create a symbolic link like this:
  1. sudo ln /usr/bin/gem1.8 /usr/bin/gem
You can update the rubygems package by running the following command:
  1. sudo gem update ––system

taken from http://beans.seartipy.com/2008/07/22/setting-up-rails-development-environment-on-ubuntu-gnulinux/

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