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Decent setup instructions for a ROR stack on Ubuntu

All you really need to know here is the magic apt-get string, which is

sudo apt-get install ruby-full build-essential

As of this writing, the ruby that comes with ruby-full is the latest build of 1.8.7. If you follow their instructions for installing rubygems, skip to the last paragraph and use

wget http://rubyforge.org/frs/download.php/45905/rubygems-1.3.1.tgz
tar xzvf rubygems-1.3.1.tgz
cd rubygems-1.3.1
sudo ruby setup.rb
sudo ln -s /usr/bin/gem1.8 /usr/bin/gem
sudo gem update --system

If you accidentally install an older version of rubygems (ie anything less than 1.3), you need to:

sudo gem install update-rubygems

restart shell (in some cases) and

sudo ruby update_rubygems