Hi, What I see is this: If in software-properties-gtk I swith from "Main server" to "German Server" (paraphrased), this diff gets written to sources.list:
-deb http://security.debian.org/debian-security bullseye-security main contrib non-free +deb http://ftp.de.debian.org/debian/ bullseye-security main contrib non-free and the new line does not work: Fehl:6 http://ftp.de.debian.org/debian bullseye-security Release 404 Not Found [IP: 141.76.2.4 80] Using the revert button fixes it to work again. Michael