Installing Ruby 1.9.3 In Ubuntu 12.04

Do note that the ruby1.9.1 package is for Ruby 1.9.3 (with Ubuntu 12.04). The version number at the end of the package name is for the ABI version of Ruby (1.9.1) that the package covers.

1. Install ruby1.9.1 package for the Ruby language (also installs the libruby1.9.1 package that contains the standard Ruby library)
2. Install ruby1.9.1-dev package in order to install gems that use native extensions