原文链接： https://blog.kelu.org/tech/2023/09/17/resolve-debian-gpg-error.html
今天对一台新机器更换了源，进行apt-get update报错：
Err:3 http://mirrors.aliyun.com/debian buster-proposed-updates InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
Err:4 http://mirrors.aliyun.com/debian buster-backports InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
Reading package lists... Done
W: GPG error: http://mirrors.aliyun.com/debian buster-proposed-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
E: The repository 'http://mirrors.aliyun.com/debian buster-proposed-updates 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.
W: GPG error: http://mirrors.aliyun.com/debian buster-backports InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 0E98404D386FA1D9 NO_PUBKEY 6ED0E7B82643E131
E: The repository 'http://mirrors.aliyun.com/debian buster-backports 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.
这是缺少必要的 GPG 公钥导致的。这些公钥用于验证从 https://ift.tt/2lZxbRa 这个源下载的软件包的完整性。
要解决这个问题，可以按照以下步骤来添加缺少的公钥：
-
先安装
GnuPG。E: gnupg, gnupg2 and gnupg1 do not seem to be installed, but one of them is required for this operation
apt install gnupg -
找到缺少的公钥的 16 进制指纹，它们在错误消息中可以找到。在这里，这两个指纹分别是
0E98404D386FA1D9和6ED0E7B82643E131。 -
使用以下命令将公钥添加到系统中：
apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 0E98404D386FA1D9 6ED0E7B82643E131这个命令会从 Ubuntu 的公钥服务器下载并添加这两个公钥到你的系统中。
-
接下来，你需要更新软件包列表，以便使更改生效：
apt update -
现在，你应该能够正常地更新和安装软件包了。
使用 GPG 密钥来验证软件包的完整性还是有必要的，可以防止恶意软件注入到你的系统中。
本文转自： https://blog.kelu.org/tech/2023/09/17/resolve-debian-gpg-error.html
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