anchor.diff:  
   |=======================================================================
   
  -include::next-steps.asciidoc[]+include::next-steps.asciidoc[]
  
positive.code: 
  ["literal",subs="attributes,callouts"]
  
  Duplicate sources.list entry http://packages.elastic.co/elasticsearch/{major-version}/debian/ ...`
  
  Examine +/etc/apt/sources.list.d/elasticsearch-{major-version}.list+ for the duplicate entry or locate the duplicate entry amongst the files in `/etc/apt/sources.list.d/` and the `/etc/apt/sources.list` file.
  ==================================================
  
negative.code: 
  ["source","sh",subs="attributes,callouts"]
  --------------------------------------------------
  echo "deb https://packages.elastic.co/elasticsearch/{major-version}/debian stable main" | sudo tee -a /etc/apt/sources.list.d/elasticsearch-{major-version}.list
  --------------------------------------------------
  
  [WARNING]
  