NO_PUBKEY error after the key was successfully added

basil-knab

4/6/24, 4:53 AM

When I run sudo apt-get update a get the following error:

Err:8 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

I can't rid off this error no matter what I try.

The ways I've tried to resolve the issue:

1. Adding key manually

I've googled how to solve the error and it seems that everybody recommends to add missing public key via apt-key:

$ sudo apt-key adv --keyserver keyserver.ubuntu.com --recv B53DC80D13EDEF05
Executing: /tmp/apt-key-gpghome.MRlBtkNXHX/gpg.1.sh --keyserver keyserver.ubuntu.com --recv B53DC80D13EDEF05
gpg: key B53DC80D13EDEF05: 1 duplicate signature removed
gpg: key B53DC80D13EDEF05: "Rapture Automatic Signing Key (cloud-rapture-signing-key-2022-03-07-08_01_01.pub)" not changed
gpg: Total number processed: 1
gpg:              unchanged: 1

After executing the commands above, the NO_PUBKEY error persist.

2. Removing repository

I've looked through the list of repositories in /etc/apt/sources.list and /etc/apt/sources.list.d and I've found /etc/apt/sources.list.d/google-cloud-sdk.list:

deb [signed-by=/usr/share/keyrings/cloud.google.gpg] https://packages.cloud.google.com/apt cloud-sdk main

I've deleted the file via sudo rm -rf /etc/apt/sources.list.d/google-cloud-sdk.list, but I still get the same error.

5785

2 + 0

apt

Score:3

Ubuntu

vvden

7/8/24, 12:04 AM

In my case nothing worked until I simply used --dearmor to make gpg binary instead of ASCII when downloading the updated key.

curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg| gpg -o /usr/share/keyrings/kubernetes-archive-keyring.gpg --dearmor

apt-get update worked after that without errors

+ 0

Score:0

Ubuntu

karel

4/6/24, 5:11 AM

Add Kubernetes signing key.

On each server node, use the curl command to download the key, then store it in a safe place (default is /usr/share/keyrings):
```
curl -fsSL https://packages.cloud.google.com/apt/doc/apt-key.gpg | sudo tee /usr/share/keyrings/kubernetes.gpg
```
Add software repositories.

Kubernetes is not included in the default repositories. To add the Kubernetes repository to your list, enter the following on each node:
```
echo "deb [arch=amd64 signed-by=/usr/share/keyrings/kubernetes.gpg] http://apt.kubernetes.io/ kubernetes-xenial main" | sudo tee -a /etc/apt/sources.list
```
Kubernetes installation tools

Kubeadm (Kubernetes Admin) is a tool that helps initialize a cluster. It fast-tracks setup by using community-sourced best practices. Kubelet is the work package, which runs on every node and starts containers. The tool gives you command-line access to clusters.

Execute the following commands (on each server node).
- Install Kubernetes tools with the command:
```
 sudo apt install kubeadm kubelet kubectl
```
  Set Kubernetes tools on hold:
```
 sudo apt-mark hold kubeadm kubelet kubectl
```
- Verify the installation with kubeadm version

_{source: How to Install Kubernetes on Ubuntu 20.04}

+ 1

basil-knab

4/6/24, 5:14 AM

What do you mean by "On each node" in the very first step of your answer? I get this error not on my k8s nodes of my k8s cluster, but on my personal machine.

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: NO_PUBKEY error after the key was successfully added

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