i installed rvm how this page says 
http://rubysource.com/installing-ruby-with-rvm-on-ubuntu/ and i am using 
ubuntu 12.04 +32 bit.
after i type ` gem install rails ` and rails installed correctly. after 
that i make ` gem install radiant ` i am getting this error.

whowantstolivefo@ubuntu:~$ gem install radiant
WARNING:  Error fetching data: SocketError: getaddrinfo: Name or service 
not known (http://rubygems.org/latest_specs.4.8.gz)
ERROR:  Could not find a valid gem 'radiant' (>= 0) in any repository
ERROR:  Possible alternatives: radiant

how can i solve this problem ? thank you.

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