ruby on rails - fetch error while installing capybara -


platform: ubuntu 12.10 x386 env: ruby 2.1.0 rails 4.1.0 rubygems 2.2.2

i trying install capybara gem , throw 503 error ! have tried change source of rubygems error persist. please show me workaround ! 

       robus@lucy:~$ gem install capybara-webkit        error:  while executing gem ... (gem::remotefetcher::fetcherror)        bad response service unavailable 503 (https://api.rubygems.org/api/v1/dependencies?gems=capybara)


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