root@teamserver:~# apt-get update
Get:1 [zxsq-anti-bbcode-url]http://mirror.neostrada.nl/kali[zxsq-anti-bbcode-/url] kali-rolling InRelease [zxsq-anti-bbcode-30.5 kB]
Err:1 [zxsq-anti-bbcode-url]http://mirror.neostrada.nl/kali[zxsq-anti-bbcode-/url] kali-rolling InRelease
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[zxsq-anti-bbcode-email]devel@kali.org[zxsq-anti-bbcode-/email]>
Fetched 30.5 kB in 1s (25.5 kB/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: [zxsq-anti-bbcode-url]http://mirror.neostrada.nl/kali[zxsq-anti-bbcode-/url] kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[zxsq-anti-bbcode-email]devel@kali.org[zxsq-anti-bbcode-/email]>
W: Failed to fetch [zxsq-anti-bbcode-url]http://http.kali.org/kali/dists/kali-rolling/InRelease[zxsq-anti-bbcode-/url] The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository <[zxsq-anti-bbcode-email]devel@kali.org[zxsq-anti-bbcode-/email]>
W: Some index files failed to download. They have been ignored, or old ones used instead.