Just FYI, Debian 11 (

bullseye

) is no longer supported -- looks like the repos are finally broken now, too: https://www.debian.org/News/2026/20260831 i.e. this will 404 on a bunch of the repos:

docker run -it --rm docker.io/debian:bullseye bash -c "apt update && apt install -y syslog-ng"