title: apt-get update not working in parrot OS
body: <p>i am trying to to do a <code>sudo apt-get update</code> in parrot OS, but all i get is this error</p>
  
  <pre><code>Err:1 http://your.repo.domain/repository JollyRoger InRelease
    Could not resolve 'your.repo.domain'
  Ign:2 http://dl.google.com/linux/chrome/deb stable InRelease                                                                                 
  Hit:3 http://dl.google.com/linux/chrome/deb stable Release                                                                                   
  Hit:4 http://deb.playonlinux.com wheezy InRelease                                            
  Get:5 http://mirrordirector.archive.parrotsec.org/parrot parrot InRelease [14.6 kB]          
  Err:5 http://mirrordirector.archive.parrotsec.org/parrot parrot InRelease
    The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED05F7B2EC3C9224
  Reading package lists... Done
  W: GPG error: http://mirrordirector.archive.parrotsec.org/parrot parrot InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY ED05F7B2EC3C9224
  E: The repository 'http://mirrordirector.archive.parrotsec.org/parrot parrot InRelease' is not signed.
  N: Updating from such a repository can't be done securely, and is therefore disabled by default.
  N: See apt-secure(8) manpage for repository creation and user configuration details.
  </code></pre>
  
  <p>how can i fix it permanently?</p>