Hi

Currently libc6-dev cannot be installed on bullseye because of unmet dependencies.

Error message:

The following packages have unmet dependencies:
libc6-dev : Depends: libc6 (= 2.31-13+deb11u4) but 2.31-13+deb11u5 is to be installed
E: Unable to correct problems, you have held broken packages.

Step to reproduce:

docker run --platform linux/amd64 -it debian:bullseye
echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list apt-get clean
apt-get update
apt-get install libc6-dev

The problem only exists when "bullseye-updates" is missing from the package sources.

Works:

$ cat /etc/apt/sources.list
deb http://deb.debian.org/debian bullseye main
deb http://deb.debian.org/debian-security bullseye-security main
deb http://deb.debian.org/debian bullseye-updates main

Does not work:

$ cat /etc/apt/sources.list
deb http://deb.debian.org/debian bullseye main

I am not sure if "bullseye-updates main" are absolutely necessary (perhaps someone can tell me). In any case, "bullseye main" is currently in a non-functioning state, without "bullseye-updates main". Thought I'd write this to point that out.

Best,
Markus

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On Mon, 31 Oct 2022 at 11:21:57 +0100, Markus Ritzmann wrote:

The following packages have unmet dependencies:
libc6-dev : Depends: libc6 (= 2.31-13+deb11u4) but 2.31-13+deb11u5 is to be installed
E: Unable to correct problems, you have held broken packages.

Step to reproduce:

docker run --platform linux/amd64 -it debian:bullseye
echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list

The debian:bullseye Docker image is produced by Debian developers,
but is not an official Debian product.
It's built by <https://github.com/debuerreotype/debuerreotype>.

If you used debootstrap or mmdebstrap to create your own chroot or
container that only includes bullseye, and not bullseye-security or bullseye-updates, then you would get libc6 (= 2.31-13+deb11u4) in
the chroot/container, and libc6-dev (= 2.31-13+deb11u4) would install successfully.

However, because you're using a container image that has been made
by someone else, what you do with that container afterwards needs to
be consistent with the assumptions they made when they created the
image. Specifically, the debuerreotype maintainers bootstrapped that
Docker image with bullseye-security and bullseye-updates included. That
means you can't assume that an apt source for plain bullseye is sufficient
to get a full set of matching packages.

(I think the debuerreotype team were correct to include -security and
-updates in their images: for most use-cases, you'll want those.)

smcv

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

Hi,

Thank you for your answer.

If you used debootstrap or mmdebstrap to create your own chroot or
container that only includes bullseye, and not bullseye-security or bullseye-updates, then you would get libc6 (= 2.31-13+deb11u4) in
the chroot/container, and libc6-dev (= 2.31-13+deb11u4) would install successfully.

However, because you're using a container image that has been made
by someone else, what you do with that container afterwards needs to
be consistent with the assumptions they made when they created the
image.

The Docker example was meant so that the problem could be reproduced
quickly. I can see the same problem with the official image debian-11.5.0-amd64-netinst.iso. Sorry for the confusion.

Step to reproduce:

1. Install Debian with debian-11.5.0-amd64-netinst.iso
2. echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list
3. apt-get clean
4. apt-get update
5. apt-get install libc6-dev

Then I get the same message:

The following packages have unmet dependencies:
libc6-dev : Depends: libc6 (= 2.31-13+deb11u4) but 2.31-13+deb11u5
is to be installed
E: Unable to correct problems, you have held broken packages.

You write:

That means you can't assume that an apt source for plain bullseye
is sufficient to get a full set of matching packages.

Perhaps this is also the case for debian-11.5.0-amd64-netinst.iso. I was
not sure at that point. Maybe that was a wrong assumption I made.

Best,
Markus

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Mon, Oct 31, 2022 at 04:42:00PM +0100, Markus wrote:

Hi,

Thank you for your answer.

If you used debootstrap or mmdebstrap to create your own chroot or container that only includes bullseye, and not bullseye-security or bullseye-updates, then you would get libc6 (= 2.31-13+deb11u4) in
the chroot/container, and libc6-dev (= 2.31-13+deb11u4) would install successfully.

However, because you're using a container image that has been made
by someone else, what you do with that container afterwards needs to
be consistent with the assumptions they made when they created the
image.

The Docker example was meant so that the problem could be reproduced
quickly. I can see the same problem with the official image debian-11.5.0-amd64-netinst.iso. Sorry for the confusion.

Step to reproduce:

1. Install Debian with debian-11.5.0-amd64-netinst.iso
2. echo 'deb http://deb.debian.org/debian bullseye main' > /etc/apt/sources.list
3. apt-get clean
4. apt-get update
5. apt-get install libc6-dev

Then I get the same message:

The following packages have unmet dependencies:
libc6-dev : Depends: libc6 (= 2.31-13+deb11u4) but 2.31-13+deb11u5
is to be installed
E: Unable to correct problems, you have held broken packages.

You write:

That means you can't assume that an apt source for plain bullseye
is sufficient to get a full set of matching packages.

netinst will by default enable security updates and stable updates [1]
and has installed *during installation* packages from there (namely at least libc6 (= 2.31-13+deb11u5).
Your "2." from above disabled those repositories, so apt can't use
those repositories anymore and will not able to resolve the dependencies.
This is the problem you are seeing.

Perhaps this is also the case for debian-11.5.0-amd64-netinst.iso. I was
not sure at that point. Maybe that was a wrong assumption I made.

[1] See installation manual 6.3.6.1.

Best,
Markus

--
tobi

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