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I'm trying to install python3-venv on Ubuntu 24.04.3 noble but getting the error:

The following packages have unmet dependencies:
    python3-venv : Depends: python3.12-venv (>= 3.12.3-0~) but it is not going to be installed
    Depends: python3 (= 3.12.3-0ubuntu1) but 3.12.3-0ubuntu2 is to be installed
E: Unable to correct problems, you have held broken packages.

apt-mark showhold does not return anything.

I've gathered that python3 3.12.3-0ubuntu2 is being provided by python3-minimal. Attempting to install python3-full gives:

The following packages have unmet dependencies:
python3-full : Depends: python3 (= 3.12.3-0ubuntu1) but 3.12.3-0ubuntu2 is to be installed
               Depends: python3.12-full (>= 3.12.3-0~) but it is not going to be installed
               Depends: python3-venv (= 3.12.3-0ubuntu1) but it is not going to be installed
               Recommends: python3-doc but it is not going to be installed
               Recommends: python3-examples but it is not going to be installed
E: Unable to correct problems, you have held broken packages.

I've tried reinstalling python3-minimal (and plain python3), but it gives:

Reinstallation of python3-minimal is not possible, it cannot be downloaded.

Any help would be appreciated!

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    I suspect this was caused by noble-updates and noble-security being disabled. updating now to verify Commented Nov 3, 2025 at 2:58
  • 1
    Your sources are incorrect or aren't updated; the correct depends rules can be seen at packages.ubuntu.com/noble-updates/python3-full which do NOT match your paste Commented Nov 3, 2025 at 3:03

1 Answer 1

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The cause was misconfigured /etc/apt/sources.list.d/ubuntu.sources. noble-updates and noble-security were not listed on the Suites line. Adding them and updating resolved the issue.

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