title: Manually installing an updated APK fails with "signatures do not match the previously installed version"
body: <p>I've built a silly app to share among a few friends. No need to put it up on the app-store.</p>
  
  <p>I built the first <code>apk</code> (signed), uploaded it to a web-server and all worked well.</p>
  
  <p>A small issue arose, I fixed it, re-built, signed with the same keystore and uploaded it again. It now seems that I am unable to install from the new <code>apk</code>. The debugger tells me:</p>
  
  <pre><code>signatures do not match the previously installed version
  </code></pre>
  
  <p>So I uninstalled the old version by opening the app drawer and dragging it onto the "uninstall" button. When opening "Settings -> Apps", I don't see it anywhere anymore. I don't see any traces of the app on my device.</p>
  
  <p>Yet I still get the above error message.</p>
  
  <p>Is it possible <em>some</em> information still lingers on the device somewhere? Is there any way I can verify that?</p>