I cant generate scaffold on linux platform

It use rails 3.0 v .but when I try to generate scaffold it perform me
Could not find gem ‘mysql2 (>= 0, runtime)’ in any of the gem sources.
Try running bundle install.
I already tried but It’s error and show bunch of massage
Using rake (0.8.7)
/usr/local/lib/site_ruby/1.8/rubygems/remote_fetcher.rb:180:in
fetch_path': SocketError: getaddrinfo: Name or service not known (http://rubygems.org/quick/Marshal.4.8/abstract-1.0.0.gemspec.rz) (Gem::RemoteFetcher::FetchError) from /usr/local/lib/site_ruby/1.8/rubygems/spec_fetcher.rb:106:infetch_spec’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/remote_specification.rb:47:in
_remote_specification' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/remote_specification.rb:25:infetch_platform’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/source.rb:247:in
download_gem_from_uri' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/source.rb:76:infetch’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/installer.rb:45:in
run' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:ineach’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/spec_set.rb:12:in
each' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/installer.rb:44:inrun’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/installer.rb:8:in
install' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/cli.rb:217:ininstall’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/vendor/thor/task.rb:22:in
send' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/vendor/thor/task.rb:22:inrun’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/vendor/thor/invocation.rb:118:in
invoke_task' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/vendor/thor.rb:246:indispatch’
from
/usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/lib/bundler/vendor/thor/base.rb:389:in
start' from /usr/lib/ruby/gems/1.8/gems/bundler-1.0.0/bin/bundle:13 from /usr/bin/bundle:19:inload’
from /usr/bin/bundle:19
What ’ s wrong and what should I do
Very thanks
again

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