问题

yang@k8s-master:/etc/apt/sources.list.d$ sudo apt update

Get:1 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease [9,383 B]

Hit:2 http://repo.huaweicloud.com/ubuntu focal InRelease

Hit:3 http://repo.huaweicloud.com/ubuntu focal-updates InRelease

Hit:4 http://repo.huaweicloud.com/ubuntu focal-backports InRelease

Err:1 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease

The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEB

Hit:5 http://repo.huaweicloud.com/ubuntu focal-security InRelease

Hit:6 https://download.docker.com/linux/ubuntu focal InRelease

Reading package lists... Done

W: GPG error: https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY FEEA9169307EA071 NO_PUBKEY 8B57C5C2836F4BEB

E: The repository 'https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial 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.

解决方法：

sudo gpg --keyserver keyserver.ubuntu.com --recv FEEA9169307EA071  # 此公钥根据自己生成的填写

sudo gpg --export --armor FEEA9169307EA071 | sudo apt-key add -

sudo apt-get update

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