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On a Ubuntu 21.04 the sudo apt update command generates console ouput as follows:

barium@berta$ sudo apt update
...
Ign:3 http://security.debian.org stable/updates InRelease                                
Err:4 http://security.debian.org stable/updates Release                                  
  404  Not Found [IP: 2a04:4e42:6c::644 80]
...
Hit:9 http://archive.ubuntu.com/ubuntu hirsute-security InRelease
Reading package lists... Done
E: The repository 'http://security.debian.org stable/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.

Manual changes to the Ubuntu Software & Updates Manager produce the same error message.

The /etc/apt/sources.list contains among others the following deb statements:

barium@berta$ cat /etc/apt/sources.list
...
deb http://archive.ubuntu.com/ubuntu hirsute-security main restricted
deb http://archive.ubuntu.com/ubuntu hirsute-security universe
deb http://archive.ubuntu.com/ubuntu hirsute-security multiverse
...

In an answer to a similar post it was suggested to replace 'archive.ubuntu.com' and 'security.ubuntu.com' with 'old-releases.ubuntu.com'. That didn't work.

barium
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    Is the use of Debian sources on your system intentional? – user535733 Nov 16 '21 at 15:47
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    Normal Ubuntu installations do not have Debian Security repositories. Try removing the lines with security.debian.org in the /etc/apt/sources.list as well as files in the folder /etc/apt/sources.list.d that refers to Debian. – user68186 Nov 16 '21 at 16:14
  • Your system is likely not a Ubuntu one; as the post you provided applies on with a Debian install. If it was added to a Ubuntu install; you may no longer be using Ubuntu as apt & dpkg cannot tell which packages are foreign or local - they upgrade to the latest available in the sources. It looks to me that you're using a Debian system & not a Ubuntu one. ubuntu-security-status may provide some clues but I'd explore what you were running, and what you're now running as it may be neither - a frakensystem with bits of both & no longer either Ubuntu or Debian. – guiverc Nov 16 '21 at 22:01
  • Does this answer your question? What can I do if a repository/PPA does not have a Release file? – karel Nov 17 '21 at 08:58
  • So far I assumed the debian packages were called implicitly by the ubuntu one's. According to your answers that shouldn't be the case so I checked the sources.list file again, but found no line containing a debain package.

    Might there be multiple sources.list files and if so where or how will I find them? In sources.list.d and elsewhere?

     – barium Nov 17 '21 at 16:47
  • Furthermore If I make changes to these files, removing the debian repos, is there any danger of corrupting the system? – barium Nov 17 '21 at 16:54
  • The machine I am working on is an Ubuntu system, but some automatization magic run on it, in order to setup many different tools that I (obviously) don't comprehend. – barium Nov 17 '21 at 17:00

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