[Rails] Stuck with Rails 3 on ubuntu

Hello Group

I am stuck with Rails 3 on Ubuntu. I followed this link :
http://torqueo.net/installing-ruby-192-and-rails-3-stable-on-ubuntu/

When I created an app, it said there was no command called rake so I
tried out sudo gem insall rake

Then when I gave rake db:migrate , I am getting this:T

$ rake db:migrate
/usr/local/ruby/lib/ruby/1.9.1/rubygems.rb:340:in `bin_path': can't
find executable rake for rake-0.8.7 (Gem::Exception)
from /usr/local/ruby/bin/rake:19:in `<main>'

I have no idea what to do. Even bundle-install is not working.

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