Users of Debian’s testing or unstable distributions may be noticing messages from apt saying things like:
WARNING: The following packages cannot be authenticated! foo bar baz Install these packages without verification [y/N]?
I noticed today that google doesn’t turn up good hits for the fix. The fix is really simple:
apt-get install debian-archive-keyring apt-get update
That’s it. You now have secure packages from Debian. Nice, eh?