【APT】The following signatures were invalid

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本文介绍了解决在执行apt-get update命令时遇到的错误“The following signatures were invalid”问题的方法。主要原因是密钥过期，解决方案是重新添加正确的密钥。

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永久地址：【APT】The following signatures were invalid（保存网址不迷路 🙃）

问题描述

在执行 apt-get update 命令时，产生如下错误：

Hit:1 https://packages.microsoft.com/ubuntu/16.04/prod xenial InRelease
Get:2 http://mirrors.ustc.edu.cn/kali kali-rolling InRelease [30.5 kB]
Hit:3 http://repo.steampowered.com/steam precise InRelease
Hit:4 https://packages.microsoft.com/ubuntu/16.04/mssql-server xenial InRelease
Hit:5 https://packages.microsoft.com/repos/vscode stable InRelease
Err:2 http://mirrors.ustc.edu.cn/kali kali-rolling InRelease
  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
Hit:6 http://repository.spotify.com stable InRelease
Hit:7 http://repo.yandex.ru/yandex-browser/deb beta InRelease
Hit:8 https://repo.skype.com/deb stable InRelease
Ign:9 http://dl.google.com/linux/chrome/deb stable InRelease
Hit:10 http://dl.google.com/linux/chrome/deb stable Release
Hit:12 https://deb.opera.com/opera-stable stable InRelease
Reading package lists... Done
W: GPG error: http://mirrors.ustc.edu.cn/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
E: The repository 'http://mirrors.ustc.edu.cn/kali kali-rolling 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.

问题原因

密钥过期，需要重新添加。

解决办法

wget -q -O - archive.kali.org/archive-key.asc | apt-key add

「APT」- E: Sub-process /usr/bin/dpkg returned an error code (1)
「APT」- Unable to get the locale encoding

参考文献

Unsigned repository for Kali Linux so I can't update. Kind of stuck and need some help here