title: E: Signature verification failed on Sideload
body: <p>I went into the cyanogen recover menu and did a full factory reset before upgrading to LinageOS. Now when I try to sideload a package to the phone is shows "E: Signature Verification Failed"</p>
  
  <p>Also, when I type </p>
  
  <pre><code>adb devices    
  </code></pre>
  
  <p>I get back</p>
  
  <pre><code>List of devices attached
  1a1e7719        unauthorized
  </code></pre>
  
  <p>Any help please! There is no OS to boot to so I cannot enable/disable USB Debugging etc.</p>
  
  <p>Also, when I try to adb push I get the following</p>
  
  <pre><code>error: device unauthorized.
  This adbd's $ADB_VENDOR_KEYS is not set; try 'adb kill-server' if that seems wrong.
  Otherwise check for a confirmation dialog on your device.
  </code></pre>