Exercise 8.2: Creating a Persistent NFS Volume (PV) -- W: GPG error:

oophilip

HiEveryone, I need help resolving this GPG error below: I tried googling it but couldn't find the right solution.

Thanks.

aleop@cp:~$ sudo apt-get update && sudo apt-get install -y nfs-kernel-server
Hit:1 https://download.docker.com/linux/ubuntu focal InRelease
Hit:3 http://australia-southeast1.gce.archive.ubuntu.com/ubuntu focal InRelease
Hit:4 http://australia-southeast1.gce.archive.ubuntu.com/ubuntu focal-updates InRelease
Hit:5 http://australia-southeast1.gce.archive.ubuntu.com/ubuntu focal-backports InRelease
Get:2 https://prod-cdn.packages.k8s.io/repositories/isv:/kubernetes:/core:/stable:/v1.29/deb InRelease [1186 B]
Hit:6 http://security.ubuntu.com/ubuntu focal-security InRelease
Err:2 https://prod-cdn.packages.k8s.io/repositories/isv:/kubernetes:/core:/stable:/v1.29/deb InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 234654DA9A296436
Reading package lists... Done
W: GPG error: **https://prod-cdn.packages.k8s.io/repositories/isv:/kubernetes:/core:/stable:/v1.29/deb InRelease: The following signatures couldn't be verified because the public key is not available: **NO_PUBKEY 234654DA9A296436
E: The repository 'https://pkgs.k8s.io/core:/stable:/v1.29/deb 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.

chrispokorni

Hi @oophilip,

I have seen a similar behavior of the apt repos for Kubernetes reported for a cluster hosted on AWS EC2. It seems the Kubernetes repos are somehow modified after the installation and upgrade steps from the earlier labs 3 and 4, and can no longer be validated by the apt package manager.

Option #1:
Try running each command separately - first the update command (even if it errors out about the Kubernetes v1.29 repo), then run the install of the nfs package.

Option #2 (if Option #1 does not install the nfs package):
Assuming your nodes are already on the desired Kubernetes version 1.29.1, remove the apt repository for Kubernetes and the gpg key:

sudo rm /etc/apt/sources.list.d/kubernetes.list
sudo rm /etc/apt/keyrings/kubernetes-apt-keyring.gpg

Then try Option #1 again.

Hope this solution will help you to move past the install step on the control plane node.

Regards,
-Chris