Apt update error

Troubleshooting
1

Hi

I’ve had this error today when doing apt update. I am a Linux noob but have used DietPi for some time. Current version is 9.14.2.

I have some idea on how to update upgrade but don’t know where to start troubleshooting.

So appreciate any help I can get.

root@DietPi:~# sudo apt update
Err:6 https://deb.debian.org/debian bullseye-backports Release     
  404  Not Found [IP: 199.232.46.132 443]
Reading package lists... Done
E: The repository 'https://deb.debian.org/debian bullseye-backports 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.

Thanks in advance.

2

hmm looks like Debian removed the repository for bullseye-backports Instructions

which version of Debian you are using? Unfortunately you missed to fill the troubleshooting template

Required

  • DietPi version | cat /boot/dietpi/.version
  • Distro version | echo $G_DISTRO_NAME $G_RASPBIAN
  • Kernel version | uname -a
  • Architecture | dpkg --print-architecture
  • SBC model | echo $G_HW_MODEL_NAME or (EG: RPi3)

@MichaIng FYI

3

This repo was sent to archive.debian.org. From time to time Debian does it.

I had the following error when updating a DietPi system (raspberry zero w):

[ INFO ] DietPi-Update | APT update, please wait...
Hit:1 https://deb.debian.org/debian bullseye InRelease
Get:2 https://deb.debian.org/debian bullseye-updates InRelease [44.0 kB]
Get:3 https://dietpi.com/apt bullseye InRelease [3530 B]
Get:4 https://deb.debian.org/debian-security bullseye-security InRelease [27.2 kB]
Get:5 https://dietpi.com/apt all InRelease [28.6 kB]
Ign:6 https://deb.debian.org/debian bullseye-backports InRelease
Err:7 https://deb.debian.org/debian bullseye-backports Release
  404  Not Found [IP: 151.101.2.132 443]
Get:8 https://archive.raspberrypi.com/debian bullseye InRelease [39.0 kB]
Get:9 https://dietpi.com/apt bullseye/main arm64 Packages [3000 B]
Get:10 https://deb.debian.org/debian-security bullseye-security/main arm64 Packages [381 kB]
Get:11 https://archive.raspberrypi.com/debian bullseye/main arm64 Packages [323 kB]
Reading package lists...
E: The repository 'https://deb.debian.org/debian bullseye-backports Release' no longer has a Release file.
[FAILED] DietPi-Update | APT update
 - Command: apt-get -y -eany update
[ INFO ] DietPi-Update | APT update, please wait...
Hit:1 https://deb.debian.org/debian bullseye InRelease
Hit:2 https://deb.debian.org/debian bullseye-updates InRelease
Hit:3 https://deb.debian.org/debian-security bullseye-security InRelease
Ign:4 https://deb.debian.org/debian bullseye-backports InRelease
Hit:5 https://dietpi.com/apt bullseye InRelease
Err:6 https://deb.debian.org/debian bullseye-backports Release
  404  Not Found [IP: 151.101.194.132 443]
Hit:7 https://archive.raspberrypi.com/debian bullseye InRelease
Hit:8 https://dietpi.com/apt all InRelease
Reading package lists...
E: The repository 'https://deb.debian.org/debian bullseye-backports Release' no longer has a Release file.
[FAILED] DietPi-Update | APT update
 - Command: apt-get -y -eany update
[FAILED] DietPi-Update | Unable to continue, DietPi-Update will now terminate.

This solved the problem:

$ diff ~/sources.list.backup /etc/apt/sources.list
4c4
< deb https://deb.debian.org/debian/ bullseye-backports main contrib non-free
---
> deb https://archive.debian.org/debian/ bullseye-backports main contrib non-free
4

The repo is still on regular APT server, AFAIK until after Debian Trixie release. But the backports suite was removed indeed: Index of /debian/dists

So we need to remove that with upcoming DietPi release as pre-patch.

Or provide it from archive indeed, but not sure whether it is worth it?

The practice is weird indeed:

I wonder why they do not mirror really all parts on both sides for a while, encourage the transition with some check in apt or so for that time, before removing it from the main repo entirely.

Also the timing: For Buster this happend just last year: DietPi has encountered an error during update to v9.3.0 · Issue #7023 · MichaIng/DietPi · GitHub
In the meantime, it has completely gone from the main repo, hence need to push another commit to the Buster-compatible branch.

5

I am also seeing this issue:
cat /boot/dietpi/.version
G_DIETPI_VERSION_CORE=9
G_DIETPI_VERSION_SUB=13
G_DIETPI_VERSION_RC=2
G_GITBRANCH=‘master’
G_GITOWNER=‘MichaIng’
G_LIVE_PATCH_STATUS[0]=‘not applicable’
G_LIVE_PATCH_STATUS[1]=‘applied’
G_LIVE_PATCH_STATUS[2]=‘applied’
G_LIVE_PATCH_STATUS[3]=‘applied’

Linux kasm 5.10.0-35-amd64 #1 SMP Debian 5.10.237-1 (2025-05-19) x86_64 GNU/Linux
amd64
Virtual Machine (x86_64)

diff: /root/sources.list.backup: No such file or directory

6

workaround until DietPi v9.15 has been released. APT | Remove bullseye-backports or migrate to archive.debian.org · Issue #7630 · MichaIng/DietPi · GitHub

sudo sed -i '/bullseye-backports/d' /etc/apt/sources.list

Basically, you should think of upgrading from Bullseye to Bookworm since the next Debian version, Trixi, is about to be released.

7

Sorry for not replying. I have been traveling out of the country for the last few days.

This workaround fixed it. I’ve also upgraded to Bookworm by following the instructions on the linked page. Newbie me didn’t know about the upgrade process and thought apt upgrade would have done that.

Thanks again!

8

lucky you, next Debian release Trixie is about to arrive soon :smiley:
So keep in mind you might need to do such an upgrade again in next 2 years :smiley:

9

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