We getting the same issues, but the work around isn't working.  when we
try to do

ruby2.0 -S gem install psych --version 2.0.17

We get:

ruby2.0 -S gem install psych --version 2.0.17
Fetching: psych-2.0.17.gem (100%)
Building native extensions.  This could take a while...
ERROR:  Error installing psych:
        ERROR: Failed to build gem native extension.

    /usr/bin/ruby2.0 extconf.rb
mkmf.rb can't find header files for ruby at /usr/lib/ruby/include/ruby.h


Gem files will remain installed in /var/lib/gems/2.0.0/gems/psych-2.0.17 for 
inspection.
Results logged to /var/lib/gems/2.0.0/gems/psych-2.0.17/ext/psych/gem_make.out

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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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