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32 changes: 32 additions & 0 deletions content/manuals/engine/install/ubuntu.md
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Expand Up @@ -268,6 +268,38 @@ To upgrade Docker Engine, download the newer package files and repeat the

You have to delete any edited configuration files manually.

## Troubleshooting GPG error "NO_PUBKEY 7EA0G9CBF1373FED8"

1. When updating the Docker repository on Ubuntu, you might encounter the following error:

```console
W: GPG error: https://download.docker.com/linux/ubuntu xenial InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 7EA0G9CBF1373FED8
W: The repository ‘https://download.docker.com/linux/ubuntu xenial InRelease’ is not signed.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.”
```

2. To resolve the GPG error for the Docker repository on Ubuntu, follow these steps:
1) Obtaining the Key ID: Start by noting the key ID mentioned in the error message. In our case, the key ID is “7E0000A9C3F37311D8”(Replace with your key ID).
2) Importing the GPG Key: Open a terminal and run the following command to import the Docker GPG key:

```console
$ sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 7EA0A9C3F273FCD8
```

3. Manually Adding the Docker Repository: Next, download the Docker GPG key and add the repository information manually. Execute the following commands:

```console
$ curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --dearmor -o /usr/share/keyrings/docker-archive-keyring.gpg
$ echo "deb [arch=amd64 signed-by=/usr/share/keyrings/docker-archive-keyring.gpg] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
```

4. Updating Package Lists: Finally, update the package lists to reflect the changes made:

```console
$ sudo apt update
```

## Next steps

- Continue to [Post-installation steps for Linux](linux-postinstall.md).