sudo apt-get install ruby1.9.1
		
		

			
wget http://production.cf.rubygems.org/rubygems/rubygems-1.6.2.tgz
tar zxvf rubygems-1.6.2.tgz
cd rubygems-1.6.2/
sudo  ruby setup.rb
# gem1.8
			
			

ubuntu

			
$ sudo apt-get install ruby1.9.1
$ sudo apt-get install rubygems1.8