title: CREATE EXTENSION postgis fails,
body: <p>I am on <code>Ubuntu 18.04</code> with the <code>psql (PostgreSQL) 12.2 (Ubuntu 12.2-2.pgdg18.04+1)</code></p>
  
  <p>Running <code>temba=# create extension postgis;</code> fails with the following error</p>
  
  <pre><code>ERROR:  could not open extension control file "/usr/share/postgresql/10/extension/postgis.control": No such file or directory
  </code></pre>
  
  <p>I ran <code>find /usr -name postgis.control</code> only to find out <code>postgis.control</code> is inside a folder named <code>12</code> instead of <code>10</code></p>
  
  <pre><code>laptop@xyz-x:~$ find /usr -name postgis.control
  /usr/share/postgresql/12/extension/postgis.control
  </code></pre>
  
  <p><strong>Edit 1</strong></p>
  
  <p>I have already ran <code>sudo apt-get install postgis</code></p>
  
  <pre><code>Reading package lists... Done
  Building dependency tree       
  Reading state information... Done
  postgis is already the newest version (3.0.1+dfsg-2.pgdg18.04+1).
  0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  </code></pre>