title: How to solve PostgreSQL pgAdmin error "Server instrumentation not installed" for adminpack?
body: <p>PostgreSQL 9.1 pgAdmin III on Ubuntu is giving this warning:</p>
  
  <blockquote>
  
  Guru Hint - Server instrumentation not installed<br><br>
  Server Instrumentation<br><br>
  The server lacks instrumentation functions.<br><br>
  pgAdmin II uses some support functions that are not available by default in all PostgreSQL versions...<br><br>
  The adminpack is installed and actived by default if ...<br><br>
  Once your extension is installed, you only need to click on the "Fix it!" button ...<br><br>
  
  </blockquote>
  
  <p>How to solve this?</p>