I want to install ruby 1.9.3 on Ubuntu without rvm

I run

sudo apt-get install ruby

It's taking ruby 1.8 and ruby 1.9.1.

And if I do 

sudo apt-get install ruby 1.9.3 -p XXXX

I am still not able to install ruby. How can I install ruby on Ubuntu?

ruby-on-rails ruby ruby-on-rails-3 ruby-on-rails-3.1 rubygems
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