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I have Ubuntu 22.04 with Nvidia 515.86.01 (proprietary), along with the CUDA toolkit and cuDNN.

nvidia/515.86.01, 5.15.0-53-generic, x86_64

After 3 weeks of holiday I am back and wanted to install a few tools (Evince for example). I was surprised to see that nothing regarding apt-get related to package installation or upgrade works due to a mysterious libnvidia-nscq:

Reading package lists... 
Done Building dependency tree...
Done Reading state information...
Done You might want to run 'apt --fix-broken install' to correct these. 
The following packages have unmet dependencies:  libnvidia-nscq-510 : Depends: libnvidia-nscq-515 but it is not installed
E: Unmet dependencies. Try 'apt --fix-broken install' with no packages (or specify a solution).

From what I can tell

  • NSCQ is a NVswitch, which is something from Nvidia regarding servers and GPUs
  • Version 510 is a transitional package

Running dpkg -l *nvidia* returns the following (among others)

iU  libnvidia-nscq-510                  515.86.01-0ubuntu0.22.04.1 amd64        Transitional package for libnvidia-nscq-515
in  libnvidia-nscq-515                  <none>                     amd64        (no description available)

I cannot figure out where this NSCQ dependency is coming from. In addition it is rather strange that 510 depends on 515 but perhaps I've misunderstood this line.

apt-cache depends libnvidia-nscq-515
libnvidia-nscq-515
  Conflicts: <libnvidia-nscq>
    libnvidia-nscq-450
    libnvidia-nscq-470
    libnvidia-nscq-525
  Replaces: <libnvidia-nscq>
    libnvidia-nscq-450
    libnvidia-nscq-470
    libnvidia-nscq-515
    libnvidia-nscq-525

I can neither run apt-get upgrade, nor apt-get autoremove, nor apt-get install <package>. I did apt-get clean to remove the cached packages and then pulled fresh ones using apt-get update.

If I am to remove the Nvidia drivers and CUDA toolkit, I am pretty sure it will break my machine learning setup (PyTorch and TensorFlow). These tools are very fiddly when it comes to which version of driver/CUDA/cuDNN is to be used.

UPDATE:

As per request in the comments:

apt policy libnvidia-nscq-515

libnvidia-nscq-515:
  Installed: (none)
  Candidate: 515.86.01-0ubuntu0.22.04.1
  Version table:
     515.86.01-0ubuntu0.22.04.1 500
        500 http://de.archive.ubuntu.com/ubuntu jammy-updates/restricted amd64 Packages
        500 http://security.ubuntu.com/ubuntu jammy-security/restricted amd64 Packages
     515.48.07-0ubuntu0.22.04.2 500
        500 https://ppa.launchpadcontent.net/canonical-kernel-team/ppa/ubuntu jammy/main amd64 Packages
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2 Answers 2

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The transition is a little confusing, because in 22.04, libnvidia-nscq-510 is in multiverse, but libnvidia-nscq-515 is in restricted. To successfully upgrade, you need to enable the restricted repositories.

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  • Thanks for the fast reply. I have enabled restricted (using add-apt-repository restricted) but the issue persists. How come I cannot find the mentioned package being installed? Commented Jan 5, 2023 at 15:26
  • Did you run apt update after enabling the repository? Commented Jan 5, 2023 at 15:28
  • :D I did. It actually does it automatically right after I added the repository (cool). Also wiped the APT cache just to be sure. Commented Jan 5, 2023 at 15:33
  • 1
    Could you edit your question to show the output of apt policy libnvidia-nscq-515? Commented Jan 5, 2023 at 15:35
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For now I was able to solve the issue (will not be surprised if some random issue pops up in due time) by manually installing the required package from /var/cache, which was displayed by the failing APT:

sudo dpkg -i --force-overwrite /var/cache/apt/archives/libnvidia-nscq-515_515.86.01-0ubuntu0.22.04.1_amd64.deb

I didn't get any errors and I was upgrade/install other packages (not related to the above mentioned one) without any noticeable issues.

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