sudo apt-get update尝试在 Kali 虚拟机上运行时收到以下消息。可能是什么原因？
root@kali:~# sudo apt-get update
Get:1 http://http.kali.org/kali kali-rolling InRelease [3,415 B]
Err:1 http://http.kali.org/kali kali-rolling InRelease
Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
Reading package lists... Done
E: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease Clearsigned file isn't valid, got 'NOSPLIT' (does the network require authentication?)
E: The repository 'http://http.kali.org/kali kali-rolling InRelease' is no longer signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) …