ubuntu-24.04 runner does not include some vcpkg dependencies that were included in ubuntu-22.04 runner

[MarkCallow]

Description

vcpkg is pre-installed on the ubuntu-24.04 runner but the runner does not include two of its dependencies which are included in the ubuntu-22.04 runner. These dependencies are mono-complete and libldtl-dev. Without mono-complete NuGet caching cannot be used. Without libldtl-dev, libxcrypthfails to build during the cmake configure step. I'm using manifest mode. I consider libxcrypt to be a dependency of vcpkg because it does not appear in the transitive dependencies of the packages I am installing.

I am opening this issue because of the failure or refusal to reopen #12342 which reported the same problem and has been closed as completed simply because I reported that I had found a workaround. That is unacceptable. The actual problem needs to be fixed.

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 22.04
• Ubuntu 24.04
• macOS 13
• macOS 13 Arm64
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• Windows Server 2019
• Windows Server 2022
• Windows Server 2025

Image version and build link

Image version 20250615.1.0.

See https://github.com/KhronosGroup/KTX-Software/actions/runs/15775043929/job/44467473454.

Is it regression?

Yes. It works with the ubuntu-22.04 runner image therefore I consider it a regression. I don't know if it ever worked in ubuntu-24.04 because this is the first time I've used it.

Expected behavior

I expected vcpkg in manifest mode to work without issue as it does in ubuntu-22.04

Actual behavior

An attempt to add sources for NuGet caching fails due to the absence of mono.

The cmake configure step fails due to the absence of libldtl-dev because that package is needed to build libxcrypt.

Repro steps

1. Find an Ubuntu project that uses manifest mode with cmake and uses NuGet caching.
2. Ensure it is not manually installing mono-complete and libldtl-dev.
3. Attempt to run CI on that project in ubuntu-24.04.
4. Observe the failure to add sources to NuGet with an error telling you to install mono-complete
5. Add a manual install of mono-complete.
6. Run the CI again.
7. Observe that adding sources now succeeds.
8. Observe the failure of cmake configure step with errors telling you that the build of libxcrypt failed because libldlt was not found.

[Prabhatkumar59]

Hi @MarkCallow - Thank you for following up again. As per your comment in this issue #12342 , you confirmed that it was resolved & succeeded by installing mono-complete and libldtl-dev.
In meantime, Could you please share your workflow and repro links so that we will look into this further more effectively, thanks!

[MarkCallow]

As per your comment in this issue #12342 , you confirmed that it was resolved & succeeded by installing mono-complete and libldtl-dev.

I did but it is my workflow that is having to install mono-complete and libldtl-dev. My point is that if vcpkg requires these things they should be included in the runner image along with vcpkg, as is the case in the ubuntu-22.04 runner images. You should not be inflicting the responsibility onto all your users.

Could you please share your workflow and repro links so that we will look into this further, thanks!

Workflow is at https://github.com/KhronosGroup/KTX-Software/blob/fix_vcpkg_caching/.github/workflows/linux.yml. To repro comment out the "Install libldtl and mono" step and follow the repro steps I gave already. As is, the workflow works.

Note that I will soon be merging this and deleting the fix_vcpkg_caching branch. If the above link does not work use https://github.com/KhronosGroup/KTX-Software/blob/main/.github/workflows/linux.ym

[Prabhatkumar59]

@MarkCallow - Thanks for your inputs and links!
https://github.com/KhronosGroup/KTX-Software/blob/main/.github/workflows/linux.ym - This link we are unable to open as it throws 404 error for us. First workflow link is opening.
We will check & investigate into this and will update you, thank you.

[Prabhatkumar59]

Hi @MarkCallow - Due to security and maintenance concerns, we are unable to add mono-complete and libltdl-dev packages for Ubuntu 24.04 at this time. This thread will be closed, but we will continue to monitor similar requests and revisit the decision in the future.
Thanks!