title: Can't remove linux kernel module, yet also cannot install module
body: <p>I have a simple scull module I have loaded with:</p>
  
  <pre><code>sudo insmod scull.ko
  </code></pre>
  
  <p>This worked fine, but I changed something in the src and recompiled, now I want to remove the old module and re-install it.</p>
  
  <p>I've tried</p>
  
  <pre><code>sudo rmmod scull.ko
  </code></pre>
  
  <p>Which returns with <code>rmmod: ERROR: Module scull is not currently loaded</code></p>
  
  <p>Yet trying to re-install gives <code>insmod: ERROR: could not insert module scull.ko: File exists</code></p>
  
  <p>What the hell?</p>