$ sudo gem install compass -V --debug
Exception `NameError' at /usr/lib/ruby/1.8/rubygems/command_manager.rb:164 - uninitialized constant Gem::Commands::InstallCommand
Exception `Gem::LoadError' at /usr/lib/ruby/1.8/rubygems.rb:779 - Could not find RubyGem test-unit (>= 0)

Exception `Gem::LoadError' at /usr/lib/ruby/1.8/rubygems.rb:779 - Could not find RubyGem sources (> 0.0.1)

GET http://rubygems.org/latest_specs.4.8.gz
302 Moved Temporarily
GET http://production.s3.rubygems.org/latest_specs.4.8.gz
304 Not Modified
GET http://rubygems.org/specs.4.8.gz
302 Moved Temporarily
GET http://production.s3.rubygems.org/specs.4.8.gz
200 OK
/usr/lib/ruby/1.8/rubygems/version.rb:156: [BUG] Segmentation fault
ruby 1.8.7 (2010-08-16 patchlevel 302) [x86_64-linux]