Signing key change for Kali Linux
The Kali Linux distribution has announced
that software updates will soon start failing for all users:
This is not only you, this is for everyone, and this is entirely our fault. We lost access to the signing key of the repository, so we had to create a new one. At the same time, we froze the repository (you might have noticed that there was no update since Friday 18th), so nobody was impacted yet. But we're going to unfreeze the repository this week, and it's now signed with the new key.
The announcement includes instructions for how to recover from the problem.