Removed the reference file as it is not applicable.

Removed the reference file as it is not applicable.

Author: sreekzz

articles/hdinsight/hdinsight-release-notes-archive.md

@@ -525,7 +525,7 @@ HDInsight 3.6 will continue to run on Ubuntu 16.04. It will change to Basic supp
 
 You need to drop and recreate your clusters if you'd like to move existing HDInsight 4.0 clusters to Ubuntu 18.04. Plan to create or recreate your clusters after Ubuntu 18.04 support becomes available.
 
-After creating the new cluster, you can SSH to your cluster and run `sudo lsb_release -a` to verify that it runs on Ubuntu 18.04. We recommend that you test your applications in your test subscriptions first before moving to production. [Learn more about the HDInsight Ubuntu 18.04 update](./hdinsight-ubuntu-1804-qa.md).
+After creating the new cluster, you can SSH to your cluster and run `sudo lsb_release -a` to verify that it runs on Ubuntu 18.04. We recommend that you test your applications in your test subscriptions first before moving to production.
 
 #### Scaling optimizations on HBase accelerated writes clusters
 HDInsight made some improvements and optimizations on scaling for HBase accelerated write enabled clusters. [Learn more about HBase accelerated write](./hbase/apache-hbase-accelerated-writes.md).