root@Msys:~# sudo apt-get update
Ign:3 http://archive.ubuntu.com/ubuntu precise InRelease
Get:6 http://archive.ubuntu.com/ubuntu precise Release [49.6 kB]
Get:9 http://archive.ubuntu.com/ubuntu precise Release.gpg [198 B]
Ign:9 http://archive.ubuntu.com/ubuntu precise Release.gpg
Hit:7 http://kali.download/kali kali-rolling InRelease
Hit:8 http://kali.download/kali kali-bleeding-edge InRelease
Reading package lists... Done
W: GPG error: http://archive.ubuntu.com/ubuntu precise Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5
E: The repository 'http://archive.ubuntu.com/ubuntu precise Release' 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.
root@Msys:~#
答案1
您看到引用的 Ubuntu 存储库是因为 Kali 只是一个高度定制的 Ubuntu 版本。