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Arunas Bartisius
Asked: 2021-08-21 08:43:33 +0800 CST

After upgrade from Debian 10 Buster to Debian 11 Bullseye security updates 404 not found

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Doing recommended upgrade path, TL;DR:

Backup data, then

apt update
apt upgrade
apt dist-upgrade
reboot

Also disable all non main stream packages if any.

Then preparing APT for new distribution:

sudo sed -i 's/buster/bullseye/g' /etc/apt/sources.list
sudo sed -i 's/buster/bullseye/g' /etc/apt/sources.list.d/*

The first command shows error:

apt update
...
Err:6 http://security.debian.org/debian-security bullseye/updates Release
  404  Not Found
Reading package lists... Done
E: The repository 'http://security.debian.org/debian-security bullseye/updates 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.
debian apt upgrade debian-buster

2 Answers

  1. This is regarding change in Debian 11 repository structure. RTFM requires time, so bump answer here:

    For Debian bullseye, the security suite is now named bullseye-security instead of codename/updates and users should adapt their APT source-list files accordingly when upgrading.

    Thus execute one more command:

    sed -i 's/bullseye\/updates/bullseye-security/g' /etc/apt/sources.list

    Now apt update works great again, and you can continue with upgrade:

    sudo apt update
sudo apt upgrade --without-new-pkgs
sudo apt full-upgrade
reboot

    Check if system is upgraded:

    lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description:    Debian GNU/Linux 11 (bullseye)
Release:    11
Codename:   bullseye

    After successful reboot, you can remove old kernel:

    sudo apt purge linux-image-4.19*

    Also review log files, for error messages of conflicting configurations or other issues.

    Issue list is here: https://www.debian.org/releases/bullseye/amd64/release-notes/ch-information.html

    • 24

  2. If you followed the various Debian update tutorials out there, chances are you ended up with an incorrect /etc/apt/source.list

    As most "fixes" are listed sed command patches, they may not work if your original source.list content isn't a perfect match.

    In that case, just edit source.list manually, the new bullseye security lines should read like

    deb http://security.debian.org/debian-security/ bullseye-security main
deb-src http://security.debian.org/debian-security/ bullseye-security main

    or alternatively if you do not need source and want contrib, it could be just

    deb http://security.debian.org/debian-security/ bullseye-security main contrib
    • 3