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Update based on comment feedback
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rbaleksandar
rbaleksandar
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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

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
added 350 characters in body
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rbaleksandar
rbaleksandar
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nvidia/515.86.01, 5.15.0-53-generic, x86_64

nvidia/515.86.01, 5.15.0-53-generic, x86_64

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).

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).

iU libnvidia-nscq-510 515.86.01-0ubuntu0.22.04.1 amd64 Transitional package for libnvidia-nscq-515

in libnvidia-nscq-515 amd64 (no description available)

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)

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

nvidia/515.86.01, 5.15.0-53-generic, x86_64

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).

iU libnvidia-nscq-510 515.86.01-0ubuntu0.22.04.1 amd64 Transitional package for libnvidia-nscq-515

in libnvidia-nscq-515 amd64 (no description available)

nvidia/515.86.01, 5.15.0-53-generic, x86_64

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).

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)

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
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rbaleksandar
rbaleksandar
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Fix broken dependency on Ubuntu 22.04 - mysterious libnvidia-nscq does not allow update or installation of existing packages

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 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.

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.