This is on Debian stable.
{{{
$sudo gem install rails
Attempting local installation of ‘rails’
Local gem file not found: rails*.gem
Attempting remote installation of ‘rails’
Updating Gem source index for: http://gems.rubyforge.org
Install required dependency activesupport? [Yn]
Install required dependency activerecord? [Yn]
Install required dependency actionpack? [Yn]
Install required dependency actionmailer? [Yn]
Install required dependency actionwebservice? [Yn]
Successfully installed rails-1.1.0
Successfully installed activesupport-1.3.0
Successfully installed activerecord-1.14.0
Successfully installed actionpack-1.12.0
Successfully installed actionmailer-1.2.0
Successfully installed actionwebservice-1.1.0
Installing RDoc documentation for activesupport-1.3.0…
Installing RDoc documentation for activerecord-1.14.0…
Installing RDoc documentation for actionpack-1.12.0…
/usr/lib/ruby/1.8/rdoc/parsers/parse_rb.rb:373: [BUG] Segmentation fault
ruby 1.8.2 (2005-04-11) [i386-linux]
Aborted
}}}