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How to fix APT error NO_PUBKEY B53DC80D13EDEF05

Problem:

When you run apt update, you see the following error message:

apt_pubkey_error.txt
Err:12 http://packages.cloud.google.com/apt gcsfuse-bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

Solution

Install the Google Cloud key using

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

After that, you can try running

apt_update.sh
sudo apt update

again.

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