Ruby on Rails

I got the following error when try to install rails-3.0.0 on my Ubuntu
box. Can anybody help?

dwang@dwang-bj-ws:~/Projects$ sudo gem install rails
Successfully installed rails-3.0.0
1 gem installed
Installing ri documentation for rails-3.0.0...
File not found: lib

dwang@dwang-bj-ws:~/Projects$ sudo gem install rails
Successfully installed rails-3.0.0
1 gem installed
Installing ri documentation for rails-3.0.0...
File not found: lib
dwang@dwang-bj-ws:~/Projects$ ruby gem
ruby: No such file or directory -- gem (LoadError)
dwang@dwang-bj-ws:~/Projects$ gem env
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.7
- RUBY VERSION: 1.8.7 (2010-01-10 patchlevel 249) [x86_64-linux]
- INSTALLATION DIRECTORY: /usr/lib/ruby/gems/1.8
- RUBY EXECUTABLE: /usr/bin/ruby1.8
- EXECUTABLE DIRECTORY: /usr/bin
- RUBYGEMS PLATFORMS:
- ruby
- x86_64-linux
- GEM PATHS:
- /usr/lib/ruby/gems/1.8
- /home/dwang/.gem/ruby/1.8
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :benchmark => false
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- http://rubygems.org/
dwang@dwang-bj-ws:~/Projects$
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