Vous avez le problème suivant en lançant la commande apt-get update ?
The following signatures were invalid: EXPKEYSIG ******************* Kali Linux Repository
Fetched 30.5 kB in 0s (31.5 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: http://archive-4.kali.org/kali kali-rolling InRelease: The following signatures were invalid: EXPKEYSIG *********** Kali Linux Repository
W: Failed to fetch http://http.kali.org/kali/dists/kali-rolling/InRelease The following signatures were invalid: EXPKEYSIG ************Kali Linux Repository
W: Some index files failed to download. They have been ignored, or old ones used instead.