Kali linux apt-get update 报错-GPG error的解决方案

阴历年后第一篇，发现Kali Linux的apt-get update报错

Err:1 http://mirrors.ustc.edu.cn/kali kali-rolling InRelease
  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[e-mail]>

使用apt-key list来查看下，发现有个keyring.gpg 过期了

apt-key list

#省略n行
/etc/apt/trusted.gpg.d/kali-archive-keyring.gpg
-----------------------------------------------
pub   rsa4096 2012-03-05 [SC] [expired: 2018-02-02]
      44C6 513A 8E4F B3D3 0875  F758 ED44 4FF0 7D8D 0BF6
uid [ expired] Kali Linux Repository <[e-mail]>

解决方案如下：
1.  下载新的文件

wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2018.1_all.deb

2. 安装下：

apt install ./kali-archive-keyring_2018.1_all.deb

3. 验证安装：新的expires: 是2021年

apt-key list

#省略

/etc/apt/trusted.gpg.d/kali-archive-keyring.gpg
-----------------------------------------------
pub   rsa4096 2012-03-05 [SC] [expires: 2021-02-03]
      44C6 513A 8E4F B3D3 0875  F758 ED44 4FF0 7D8D 0BF6
uid [ unknown] Kali Linux Repository <[e-mail]>
sub rsa4096 2012-03-05 [E] [expires: 2021-02-03]

4. 删掉了一个历史遗留keyring .

/etc/apt/trusted.gpg.d/sogou-archive-keyring.gpg
------------------------------------------------
pub   rsa4096 2014-04-09 [SC]
      6CE3 5A4E BAB6 7609 4476  BE7C D259 B755 5E1D 3C58
uid [ unknown] Ubuntu Kylin Archive Automatic Signing Key <[e-mail]>
sub rsa4096 2014-04-09 [E]

#以前安装搜狗拼音的时候遗留的产物。

apt-key del "6CE3 5A4E BAB6 7609 4476  BE7C D259 B755 5E1D 3C58"
OK