I tried to upgrade my Debian System using
apt, the repository is set to "testing" so I expected it to change to the next version "Bullseye" from "Buster" automatically but since "Buster" moved on I get:
404 Not Found [IP: 188.8.131.52 80]
security.debian.org address does not seem to have Release files, did the address change?
E: The repository 'http://security.debian.org testing/updates Release' no longer has a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details.
this are the relevant entries of my
deb http://ftp.ch.debian.org/debian/ testing main contrib non-free deb-src http://ftp.ch.debian.org/debian/ testing main contrib non-free deb http://security.debian.org/ testing/updates main contrib non-free deb-src http://security.debian.org/ testing/updates main contrib non-free # jessie-updates, previously known as 'volatile' deb http://ftp.ch.debian.org/debian/ testing-updates main contrib non-free deb-src http://ftp.ch.debian.org/debian/ testing-updates main contrib non-free
man apt-secure but could not find or understand the relevant information.
Update: I got two answers so far, both referring to the ofical debian.org page, but suggest a complete different solution. Can someone please explain, since I decided to not remove the
security.debian.org entries, but changed the version-attribute format.