I tried installing Ruby on Rails by following this guide: http://elinux.org/RPi_Ruby_on_Rails
when reach to command
curl -L get.rvm.io | bash -s stable --rails
I got message
RROR: Could not find a valid gem 'rails' (>= 0), here is why:
Unable to download data from http://rubygems.org/ - no such name (http://rubygems.org/latest_specs.4.8.gz)
How can I solve this problem?