I have a workaround - I downgraded to the previous version:

apt-get install ruby2.0=2.0.0.484-1ubuntu2 libruby2.0=2.0.0.484-1ubuntu2
ruby2.0 -S gem install psych --version 2.0.17
apt-get install ruby2.0
ruby2.0 -S gem -r yaml -r rubygems/safe_yaml install $whatever

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https://bugs.launchpad.net/bugs/1777174

Title:
  2.0.0.484-1ubuntu2.10 triggers uninitialized constant Gem::SafeYAML on
  calling gem2.0 install

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