1、aptget升级包失败？
root@chalon:~# apt update Hit:1 http://mirrors.aliyun.com/ubuntu focal InRelease Hit:2 http://mirrors.aliyun.com/ubuntu focal-security InRelease Hit:3 http://mirrors.aliyun.com/ubuntu focal-updates InRelease Get:4 https://mirrors.aliyun.com/kubernetes/apt kubernetes-xenial InRelease [9,383 B] Hit:5 http://mirrors.aliyun.com/ubuntu focal-proposed InRelease Hit:6 http://mirrors.aliyun.com/ubuntu focal-backports InRelease Err:4 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 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.
原因分析：重新全部生成过密钥导致该问题出现。
解决方法：再次针对aptget生成密钥。
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8B57C5C2836F4BEB
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys FEEA9169307EA071
