报错如下

┌──(root💀kali)-[~]
└─# sudo apt-get update                                                                                                                                                     2 ⚙
获取:1 http://kali.download/kali kali-rolling InRelease [41.2 kB]
错误:1 http://kali.download/kali kali-rolling InRelease
  下列签名无效： EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
已下载 41.2 kB，耗时 3秒 (15.7 kB/s)
正在读取软件包列表... 完成
W: 校验数字签名时出错。此仓库未被更新，所以仍然使用此前的索引文件。GPG 错误：http://kali.download/kali kali-rolling InRelease: 下列签名无效： EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
W: 无法下载 http://http.kali.org/kali/dists/kali-rolling/InRelease  下列签名无效： EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
W: 部分索引文件下载失败。如果忽略它们，那将转而使用旧的索引文件。
                                                                                                                                                                                
┌──(root💀kali)-[~]
└─# wget archive.kali.org/archive-key.asc                                                                                                                                   2 ⚙
--2023-02-26 06:31:16--  http://archive.kali.org/archive-key.asc
正在解析主机 archive.kali.org (archive.kali.org)... 192.99.45.140
正在连接 archive.kali.org (archive.kali.org)|192.99.45.140|:80... 已连接。
已发出 HTTP 请求，正在等待回应... 200 OK
长度：3155 (3.1K) [application/octet-stream]
正在保存至: “archive-key.asc”

archive-key.asc            100%[===============================>]   3.08K  1.46KB/s  用时 2.1s    

2023-02-26 06:31:20 (1.46 KB/s) - 已保存 “archive-key.asc” [3155/3155])

​
​ ┌──(root💀kali)-[]
​ └─# apt-key add archive-key.asc 2 ⚙
​ Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)).
​ OK
​
​ ┌──(root💀kali)-[]
​ └─# sudo apt-get update 2 ⚙
​ 获取:1 http://kali.download/kali kali-rolling InRelease [41.2 kB]
​ 获取:2 http://kali.download/kali kali-rolling/main amd64 Packages [19.5 MB]
​ 获取:3 http://kali.download/kali kali-rolling/main amd64 Contents (deb) [45.4 MB]
​ 获取:4 http://kali.download/kali kali-rolling/contrib amd64 Packages [116 kB]
​ 获取:5 http://kali.download/kali kali-rolling/contrib amd64 Contents (deb) [172 kB]
​ 获取:6 http://kali.download/kali kali-rolling/non-free amd64 Packages [222 kB]
​ 获取:7 http://kali.download/kali kali-rolling/non-free amd64 Contents (deb) [931 kB]
​ 已下载 66.3 MB，耗时 49秒 (1,360 kB/s)
​ 正在读取软件包列表… 完成

解决方法如下

wget archive.kali.org/archive-key.asc   //下载签名
apt-key add archive-key.asc   //安装签名