title: Unusable Compute Node in Batch pool
body: <p>I am trying to create a pool with an <strong>application package</strong> installed on all nodes, however I keep getting that the <strong>compute nodes are unusable</strong>. My guess was that there was an error with the installation of application packages that caused the nodes to go to the unusable state. But then I got confused as I am able to install the same application packages at a task level in another pool. 
  What could possibly be the problem? What causes the nodes to go to unusable state? And if my guess was right, What could cause an application package not to be installed properly in a pool and how can I fix that?</p>
  
  <p>Thanks!</p>