0xD3ADB33F

if you want to bypass the key expired problem you can dl faketime and libfaketime 0.9.6-3 .deb from https://archive.debian.org/debian/pool/main/f/faketime/ dpkg -i those, then you can impose a date for example apt-get update (or apt update) can then be "completed" like this faketime 2020-01-01 apt-get update it will ensure you a clean update without key problem 🙂 Enjoy