Installing a system Ruby 2.0 on Ubuntu 14.04, because they won't fix the bug and `update-alternatives` "doesn't support Ruby."

aftermath.md

ubuntu@ruby20:~$ which ruby
/usr/bin/ruby
ubuntu@ruby20:~$ ruby --version
ruby 2.0.0p384 (2014-01-12) [x86_64-linux-gnu]

ruby2-0.rb

# As a chef recipe:
package "ruby2.0"

%w{erb gem irb rake rdoc ri ruby testrb}.each do |rb|
  link "/usr/bin/#{rb}" do
    to "/usr/bin/#{rb}2.0"
  end
end

ruby2-0.sh

# As a shell script:
sudo apt-get install ruby2.0

for i in erb gem irb rake rdoc ri ruby testrb
do
  sudo ln -sf /usr/bin/${i}2.0 /usr/bin/${i}
done