When booting up a older Kali VM I hadn’t used for a while, I wanted to update it & ran into a small issue. Namely whilst trying to update I ran into the following error message:

root@kali:~/Documents# apt-get update
Get:1 http://kali.koyanet.lv/kali kali-rolling InRelease [30.5 kB]
Err:1 http://kali.koyanet.lv/kali kali-rolling InRelease
The following signatures were invalid: EXPKEYSIG ED444FF07D8D0BF6 Kali Linux Repository devel@kali.org
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://kali.koyanet.lv/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.

As it seems, the GPG key had been changed. Fortunately the fix is easy, just do the following:

  • Check which is the most current key-s file at https://http.kali.org/kali/pool/main/k/kali-archive-keyring/ and download it. For example today it was “ kali-archive-keyring_2020.2_all.deb “.
  • Download it using the wget command or via browser:
    wget https://http.kali.org/kali/pool/main/k/kali-archive-keyring/kali-archive-keyring_2020.2_all.deb
  • Install it by running “pkg -i kali-archive-keyring_2020.2_all.deb”
    root@kali:~/Documents# dpkg -i kali-archive-keyring_2020.2_all.deb
    (Reading database … 528672 files and directories currently installed.)
    Preparing to unpack kali-archive-keyring_2020.2_all.deb …
    Unpacking kali-archive-keyring (2020.2) over (2018.2) …
    Setting up kali-archive-keyring (2020.2) …
    Installed kali-archive-keyring as a trusted APT keyring.
  • Now updating should work again.
    root@kali:~/Documents# apt-get update
    Get:1 http://kali.koyanet.lv/kali kali-rolling InRelease [30.5 kB]
    Get:2 http://kali.koyanet.lv/kali kali-rolling/main i386 Packages [17.5 MB]
    Get:3 http://kali.koyanet.lv/kali kali-rolling/non-free i386 Packages [167 kB]
    Get:4 http://kali.koyanet.lv/kali kali-rolling/contrib i386 Packages [97.7 kB]
    Fetched 17.8 MB in 3s (5,676 kB/s)
    Reading package lists… Done