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README.md

@@ -27,6 +27,7 @@ As before, we have provided a VagrantFile in the `p5` directory. We have include
 2. Uncompress with `tar zxvf spark-2.0.1-bin-hadoop2.7.tar.gz`
 3. This will create a new directory: `spark-2.0.1-bin-hadoop2.7`. 
 4. Set the SPARKHOME variable: `export SPARKHOME=/vagrant/spark-2.0.1-bin-hadoop2.7`
+5. Install Java:  `sudo apt-get install default-jre`
 
 We are ready to use Spark.