1. install all file or packages that support ruby
root@ubuntu:~# apt-get install build-essential ruby libruby rdoc
libyaml-ruby libzlib-ruby libopenssl-ruby libdl-ruby libreadline-ruby
libiconv-ruby rubygems sqlite3 libsqlite3-ruby libsqlite3-dev irb
subversion
2. download ruby gem
root@ubuntu:~# wget http://rubyforge.org/frs/download.php/11289/rubygems-1.3.3.tgz
3. extract it
root@ubuntu:~# tar -xvzf rubygems-1.3.3.tgz
4. goto ruby gem directory
root@ubuntu:~# cd rubygems-1.3.3
5. run the setup
root@ubuntu:~# ruby setup.rb
6. install gem rails
root@ubuntu:~# gem install rails 2.3.2
7. download metasploit framework
root@ubuntu:~# svn co http://metasploit.com/svn/framework3/trunk/ metasploit
8. goto metasploit directory
root@ubuntu:~# cd metasploit
9. update metasploit
root@ubuntu:~# svn up
10. run metasploit
root@ubuntu:~# ./msfconsole
11. documentation
http://metasploit.com/
http://rubygems.org/
http://rubyforge.org/
http://rubyonrails.org/
http://oonboy.blogspot.com/