Description#
As the title suggests, an error occurred during the execution of apt update in Debian 11, specifically related to Debian bookworm.
The error message is as follows:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
6 packages can be upgraded. Run 'apt list --upgradable' to see them.
N: Repository 'Debian bookworm' changed its 'non-free component' value from 'non-free' to 'non-free non-free-firmware'
N: More information about this can be found online in the Release notes at: https://www.debian.org/releases/bookworm/amd64/release-notes/ch-information.html#non-free-split
The reason behind this is that the change in versions resulted in a modification of the non-free component in the apt source. According to the warning description, the file contents of sources.list should be modified by changing "non-free" to "non-free-firmware".
Of course, if you have already modified the source to a domestic one, it is still necessary to check the component in the public source list to ensure its correctness. In general, modifying sources.list according to the description of the open-source apt source should not cause this problem (isn't this obvious?)
There are exceptions to everything, otherwise it wouldn't be recorded.
The machine I am using is in an internal network environment, where a source mirror is deployed. The component addresses of the source are accessed through proxy forwarding. In this case, modifying the file may still cause issues.
For example:
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
6 packages can be upgraded. Run 'apt list --upgradable' to see them.
W: Skipping acquire of configured file 'non-free-firmware/source/Sources' as repository 'http://repos.inside.com:19796/debian bullseye-updates InRelease' doesn't have the component 'non-free-firmware' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'non-free-firmware/binary-amd64/Packages' as repository 'http://repos.inside.com:19796/debian bullseye-updates InRelease' doesn't have the component 'non-free-firmware' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'non-free-firmware/i18n/Translation-en' as repository 'http://repos.inside.com:19796/debian bullseye-updates InRelease' doesn't have the component 'non-free-firmware' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'non-free-firmware/i18n/Translation-zh_CN' as repository 'http://repos.inside.com:19796/debian bullseye-updates InRelease' doesn't have the component 'non-free-firmware' (component misspelt in sources.list?)
W: Skipping acquire of configured file 'non-free-firmware/i18n/Translation-zh' as repository 'http://repos.inside.com:19796/debian bullseye-updates InRelease' doesn't have the component 'non-free-firmware' (component misspelt in sources.list?)
For security reasons, I made up the addresses, but in reality, this method is used to locate the remote source components, allowing internal network devices to perform apt updates and installations.
In this case, the information provided by apt is that the address does not have the non-free-firmware component. This means that modifying "non-free" to "non-free-firmware" will not enable apt updates.
This is also the reason why it is necessary to check the components of the Debian source on the source address page.
I've talked a bit too much. Below is the solution.
Solution#
The classic solution to not finding a solution is to solve the "person" who raised the problem, in this case, preventing apt from issuing warnings.
su -c 'echo "APT::Get::Update::SourceListWarnings::NonFreeFirmware \"false\";" > /etc/apt/apt.conf.d/no-bookworm-firmware.conf'
After executing the above command, you can perform apt updates and install other packages.