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最近Ubuntu的服务器，apt update的时候遇到报错如下：
W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http://nginx.org/packages/mainline/ubuntu focal InRelease: The following signatures were invalid: EXPKEYSIG ABF5BD827BD9BF62 nginx signing key <signing-key@nginx.com>
W: Failed to fetch http://nginx.org/packages/mainline/ubuntu/dists/focal/InRelease The following signatures were invalid: EXPKEYSIG ABF5BD827BD9BF62 nginx signing key <signing-key@nginx.com>
W: Some index files failed to download. They have been ignored, or old ones used instead.
查了下，需要更新下密钥，方法如下：
cd /tmp
wget https://nginx.org/keys/nginx_signing.key
apt-key add nginx_signing.key
参考资料
official nginx trusty ppa gives KEYEXPIRED gpg error
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