[Software][Solved] Can't update using sudo apt update (debian 12)

[Rens]

Hello, I am kind of new to linux and I am using debian 12 as my server OS. When I try to sudo apt update I get this message:

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rens@ServerRens:~$ sudo apt update
[sudo] password for rens:
Hit:1 http://deb.debian.org/debian bookworm InRelease
Hit:2 http://deb.debian.org/debian bookworm-updates InRelease
Hit:3 http://security.debian.org/debian-security bookworm-security InRelease
Ign:4 http://deb.debian.org/debian -backports InRelease
Err:5 http://deb.debian.org/debian -backports Release
  404  Not Found [IP: 151.101.38.132 80]
Hit:6 https://download.docker.com/linux/debian bookworm InRelease
Reading package lists... Done
E: The repository 'http://deb.debian.org/debian -backports Release' does not have 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.

[fabien]

Hello, welcome!

Correct your sources.list according to Debian Backports ›› Instructions

Your problem occurs because you copied a line that uses a variable. When this variable is not assigned, it does not work.

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$> echo "deb https://deb.debian.org/debian ${codename}-backports main contrib non-free non-free-firmware"
deb https://deb.debian.org/debian -backports main contrib non-free non-free-firmware
$> codename="bookworm"
$> echo "deb https://deb.debian.org/debian ${codename}-backports main contrib non-free non-free-firmware"
deb https://deb.debian.org/debian bookworm-backports main contrib non-free non-free-firmware

note: please use code tags for terminal outputs, I fixed it for you this time.

[Rens]

It still does not work, can be that I put your lines of code in wrong. The sources.list shows this:

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#deb cdrom:[Debian GNU/Linux 12.7.0 _Bookworm_ - Official amd64 NETINST with firmware 20240831-10:38]/ bookw>

deb http://deb.debian.org/debian/ bookworm main non-free-firmware
deb-src http://deb.debian.org/debian/ bookworm main non-free-firmware

deb http://security.debian.org/debian-security bookworm-security main non-free-firmware
deb-src http://security.debian.org/debian-security bookworm-security main non-free-firmware

# bookworm-updates, to get updates before a point release is made;
# see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
deb http://deb.debian.org/debian/ bookworm-updates main non-free-firmware
deb-src http://deb.debian.org/debian/ bookworm-updates main non-free-firmware

# This system was installed using small removable media
# (e.g. netinst, live or single CD). The matching "deb cdrom"
# entries were disabled at the end of the installation process.
# For information about how to configure apt package sources,
# see the sources.list(5) manual.

[fabien]

There is no backports line in your (presumably) /etc/apt/sources.list
Check files in the /etc/apt/sources.list.d/ directory.

It still does not work, can be that I put your lines of code in wrong.

My lines are just an example to demonstrate how variables work, they do nothing else.

[Rens]

There is nothing in the /etc/apt/sources.list.d/ file or the file just doesn't exist

[fabien]

There is nothing in the /etc/apt/sources.list.d/ file or the file just doesn't exist

/etc/apt/sources.list.d/ is a directory.

What gives

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$> grep --color=auto -r "backports" /etc/apt/

?

[Rens]

After reading your suggestions again I saw what my error was.

In the directory: /etc/apt/sources.list.d
There was a file named: backports.list

And here I saw this line was not set correctly.

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deb http://deb.debian.org/debian -backports main

Here I set the bookworm name back and after that the apt command worked as expected!

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deb http://deb.debian.org/debian bookworm-backports main

Thank you so much for your help!


I am wondering why this value was not set in the first place? Because I had not done anything with this before hand?

[fabien]

You're welcome, I'm glad I helped solve this issue. Please mark your topic as [Solved] by editing the title of your first post, i.e.
[Software][Solved] Can't update using sudo apt update (debian 12)

I am wondering why this value was not set in the first place?

As I said in my first post, I assume you applied a command line you found somewhere that uses a variable that was not assigned in your environment.

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$> echo "${codename}-backports" >/tmp/test.file
$> cat /tmp/test.file 
-backports
$> codename="bookworm"
$> echo "${codename}-backports" >/tmp/test.file
$> cat /tmp/test.file 
bookworm-backports