Rails - May 2009 - acts_as_list not working despite being installed

I just installed a newer version of Ubuntu and so with it, rails
2.3.2. Now I can''t get acts_as_list working. I get the error:

undefined method `acts_as_list'' for Child(Table doesn''t
exist):Class

But I have already run
> ruby script/plugin install acts_as_list
+ ./README
+ ./init.rb
+ ./lib/active_record/acts/list.rb
+ ./test/list_test.rb

I started a new program that had nothing but the creation of a class
that uses acts_as_list. Can somebody please help?