Я хочу запустить обновление, но, как я запускаю следующую команду:

apt-get update

Это показывает ошибки, вот оно!

Hit:2 http://deb.torproject.org/torproject.org wheezy InRelease                
Get:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease [30.5 kB]       
Err:1 http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6  Kali Linux Repository <devel@kali.org>
Fetched 30.5 kB in 4s (6,866 B/s)
Reading package lists... Done
W: An error occurred during the signature verification. The repository is     not updated and the previous index files will be used. GPG error:         http://ftp.yzu.edu.tw/Linux/kali kali-rolling InRelease: The following     signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository       <devel@kali.org>
 W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease          The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux         Repository <devel@kali.org>
W: Some index files failed to download. They have been ignored, or old ones used instead.

Пожалуйста, помогите мне!

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