[Rails] Update Ruby Version!

Hey guys

I am running Ruby 1.8.7 on Ubuntu 10.04

How can I update it to 1.9.1? I tried instaling the 1.9.1 package,
everything seemed to work, but if I run "ruby -v" it still says
1.8.7.

I might be doing something wrong... so can someone plot out the steps
to updating the ruby version?

Thank you

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