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How to install rubygems in Ubuntu 12.04 with Ruby 1.9.3

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http://askubuntu.com – So I used these commands: sudo apt-get install ruby 1.9.3 cd /etc/alternatives sudo ln -sf /usr/bin/ruby1.9.3 ruby from http://stackoverflow.com/questions/11078166/how-do-i-install-ruby-1-9-3-... in order to get ruby 1.9.3 and make it the default. That appears to have worked fine. Now when I attempt to use gem install it tells me the gems are already the latest. However, when I attempt to run a script it tells me it can't find the gem I require on the first line. Long story short, this script didn't work in ruby 1.8.7 due to an error farther down in the code but did get p (HowTos)