kali更新失败

　　今天更新kali时失败，出现如下问题：

root@kali:~# apt-get update
Get: http://mirrors.aliyun.com/kali kali-rolling InRelease [30.5 kB]
Err: http://mirrors.aliyun.com/kali kali-rolling InRelease
  The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
Reading package lists... Done
W: GPG error: http://mirrors.aliyun.com/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <devel@kali.org>
E: The repository 'http://mirrors.aliyun.com/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() manpage for repository creation and user configuration details.

　　解决办法：

root@kali:~# wget -q -O - https://archive.kali.org/archive-key.asc | apt-key add
OK

　　再次更新：

root@kali:~# apt-get update
Get: http://mirrors.aliyun.com/kali kali-rolling InRelease [30.5 kB]
Get: http://mirrors.aliyun.com/kali kali-rolling/main Sources [12.0 MB]
Get: http://mirrors.aliyun.com/kali kali-rolling/contrib Sources [60.8 kB]
Get: http://mirrors.aliyun.com/kali kali-rolling/non-free Sources [132 kB]
Get: http://mirrors.aliyun.com/kali kali-rolling/main amd64 Packages [16.2 MB]
Get: http://mirrors.aliyun.com/kali kali-rolling/non-free amd64 Packages [166 kB]
Get: http://mirrors.aliyun.com/kali kali-rolling/contrib amd64 Packages [102 kB]
Fetched 28.6 MB in 6s (, kB/s)
Reading package lists... Done

另附上kali更新源：

　　kali更新源 ： https://www.cnblogs.com/Hi-blog/p/5955113.html

Reference:

　　https://unix.stackexchange.com/questions/421821/invalid-signature-for-kali-linux-repositories-the-following-signatures-were-i