anchor.diff:  
   ##<a id='available-stacks'></a>Available Stacks ##
   
  -The Linux `cflinuxfs2` stack is derived from Ubuntu Trusty 14.04. Refer to the Github stacks page for supported [libraries](https://github.com/cloudfoundry/stacks/blob/master/cflinuxfs2/cflinuxfs2_receipt).
  +<%= vars.product_short %> <%= vars.current_major_version %> includes support for the following stacks:
  +
  + * **cflinuxfs3**: The Linux `cflinuxfs3` stack is derived from Ubuntu Bionic 18.04.
  +Refer to the GitHub stacks page for supported [libraries](https://github.com/cloudfoundry/cflinuxfs3/blob/master/receipt.cflinuxfs3.x86_64).
  + * **cflinuxfs2**: The Linux `cflinuxfs2` stack is derived from Ubuntu Trusty 14.04.
  +Refer to the GitHub stacks page for supported [libraries](https://github.com/cloudfoundry/stacks/blob/master/cflinuxfs2/cflinuxfs2_receipt).
  +  <p class="note breaking"><strong>Breaking Change</strong>: Support for Ubuntu Trusty 14.04 ends in April 2019.
  +  Future versions of <%= vars.product_short %> may remove support for <code>cflinuxfs2</code>.
  +  Push all new apps using <code>cflinuxfs3</code> and migrate existing apps to <code>cflinuxfs3</code> as soon as possible.
  +  For more information about the Ubuntu support lifecycle, see the <a href="https://www.ubuntu.com/about/release-cycle">Canonical</a> documentation.</p>
   
   <%= vars.custom_stack %>
   
  
positive.code: ##<a id='stacks-api'></a>Stacks API ##
  
  For API information, review the Stacks section of the [Cloud Foundry API Documentation](http://apidocs.cloudfoundry.org).
  
    
  
negative.code: 
  It can be difficult to know what libraries an app statically links to, and it depends on the languages you are using. One example is an app that uses a Ruby or Python binary, and links out to part of the C standard library. If the C library requires an update, you may need to recompile the app and restage it as follows:
  
  1. Use the [cf stacks](http://cli.cloudfoundry.org/en-US/cf/stacks.html) command to list the stacks available in a deployment.
  
      <pre class='terminal'>
      $ cf stacks
  