title: APK install error ("package with that name and different signature"), but certificate info is the same
body: <p>I have an update to my app that I packaged with the same key as my original app, but when I try to run the APK on my device (emailed to myself), I get this error:</p>
  
  <p>"Application not installed. Package with that name and different signature already installed."</p>
  
  <p>But I used keytool to compare the certificate fingerprints of the META-INF/<em>APP</em>.RSA files of both the original apk and the new one, and they match.</p>
  
  <p>I definitely don't want users to have to uninstall and reinstall the app in order to get this update.</p>
  
  <p>Any help or insight is greatly appreciated!</p>