Sphinx Installation on Ubuntu 18.04

Ran into these errors while trying to install Sphinx on 18.04:
On running sudo apt-get update got the following error message

GPG error: http://plf.parrot.com/sphinx/binary bionic/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 47727EDC508B1AE5
E: The repository 'http://plf.parrot.com/sphinx/binary bionic/ 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.

What should I do?

You should run this command line to add the key:
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 508B1AE5
sudo apt-get update
sudo apt-get install parrot-sphinx

I did. Got the following error:

Executing: /tmp/apt-key-gpghome.yKWSOOK0Nv/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys 508B1AE5
gpg: keyserver receive failed: No keyserver available

There may be an issue with this server. You could try another one:
sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 508B1AE5

Hello! I had the same problem. How did you manage to solve it?


Have you tried another server?

sudo apt-key adv --keyserver keys.gnupg.net --recv-keys 508B1AE5

Yes, I did. But I am getting time outs connecting to the keyserver

Can you ping the server? If not, you probably have network issues. Are you trying to install Sphinx in a virtual machine?

I found out that the problem was with the version of gnupg installed on my system. That’s why I was not getting a response from the servers. I downgraded it to gnupg 2.1.17 and it worked.

Great! Can you tell me which version of gnupg you were using? I don’t have any issue with gnupg 2.2.4.

Please update the docs with this info here: https://developer.parrot.com/docs/sphinx/installation.html#install-the-packages


when I enter the below command:
$ sudo systemctl start firmwared.servic:

I get error:
Failed to start firmwared.service: Unit firmwared.service not found.
I would appreciate if anyone share with me knowledge about this issue.


Have you restarted your machine after installing Sphinx?
Does the file /lib/systemd/system/firmwared.service exist?

1 Like

Hi Ocrave,
the machine has been restarted and solved the problem.
Thanks for your kind help