title: "app not installed" when installing signed apk
body: <p>I recently forked a project and created a signed apk, I already changed the package name both in gradle file and manifest, and also signed the apk with signature version V1 and V2, but upon installing it says "app not installed".
  The original app was installed in my device, but after uninstalling it the signed apk I created starts installing. Any idea what caused this to happen?</p>