Problem(Error) in ruby-on rails installtion

To install the ruby-on rails on my computer i used the following commands in terminal

1)sudo apt-get install build-essentail (completed successfully)

2)sudo apt-get install ruby-full (completed successfully)

3)Download the rubygems-1.3.7.tgz in download directory and the

                  cd Downloads
                  sudo tar -xvzf rubygems-1.3.7.tgz
                  cd rubygems-1.3.7
                 ruby setup.rb                                     (completed successfully)
  1. Then change directory as
    cd /usr/bin
    Then typed

                         sudo gem install rails --version 2.3.2 --include-dependencies                                
    
                                          After this command ,i got the following error
    
          
              amrit@amrit-desktop:~$ cd /usr/bin
              amrit@amrit-desktop:/usr/bin$ sudo gem install rails --version 2.3.2 --include-dependencies;
              [sudo] password for amrit:
               ERROR:  Loading command: install (LoadError)
               no such file to load -- zlib
               ERROR:  While executing gem ... (NameError)
               uninitialized constant Gem::Commands::InstallCommand
             amrit@amrit-desktop:/usr/bin$
    

Please somebody help to resolve it

Thanks in advance

It looks like a problem with your ruby installation. Specifically you
Ruby has been built without zlib. I suggest you email ruby-talk:

  http://www.ruby-lang.org/en/community/mailing-lists/

Make sure to include the system type you're using. You may also want to
try the support forums for the OS you're using. Either way, this is
outside the scope of the rails-core list.

Thanks.