Unable to add apt repo - Mirror sync in progress

Same issue here, nvidia/cuda:11.8.0-cudnn8-devel-ubuntu20.04

Same issue for us: nvidia/cuda:11.2.2-cudnn8-runtime-ubuntu20.04

Removing the cuda list from the apt sources should do the trick.
So, the following in the most generic case:

rm /etc/apt/sources.list.d/cuda.list && apt-key del 7fa2af80

Note that the exact list name is dependent on the exact repo you added, for example for me it was:

rm /etc/apt/sources.list.d/cuda-ubuntu2004-x86_64.list && apt-key del 7fa2af80
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Same issue since yesterday.

$ sudo add-apt-repository "deb https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/ /"
...
Get:4 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  Packages [1.127 kB]   
Err:4 https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64  Packages              
  File has unexpected size (1127072 != 1126689). Mirror sync in progress? [IP: 152.199.52.179 443]
  Hashes of expected file:
   - Filesize:1126689 [weak]
   - SHA256:7cee2584ca6d97b2f07018ba4f9c3c473fb4e299ed170968a1f8c99c090cc59f
   - SHA1:4ee24fac5518a3fcc3702590a0dab32c95484c54 [weak]
   - MD5Sum:593faff511765d11055c9919bf2e3bf8 [weak]
  Release file created at: Thu, 17 Aug 2023 19:03:05 +0000
...
Fetched 5.931 B in 2s (2.572 B/s)
Reading package lists... Done
E: Failed to fetch https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/Packages.gz  File has unexpected size (1127072 != 1126689). Mirror sync in progress? [IP: 152.199.52.179 443]
   Hashes of expected file:
    - Filesize:1126689 [weak]
    - SHA256:7cee2584ca6d97b2f07018ba4f9c3c473fb4e299ed170968a1f8c99c090cc59f
    - SHA1:4ee24fac5518a3fcc3702590a0dab32c95484c54 [weak]
    - MD5Sum:593faff511765d11055c9919bf2e3bf8 [weak]
   Release file created at: Thu, 17 Aug 2023 19:03:05 +0000
E: Some index files failed to download. They have been ignored, or old ones used instead.

Ubuntu 20.04.2 LTS.

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Same issue persists:

build   Prepare to install dependencies 2023-08-18T20:58:25.6841494Z E: Failed to fetch https://developer.download.nvidia.com/compute/cuda/repos/ubuntu2004/x86_64/Packages.gz  File has unexpected size (1127072 != 1126689). Mirror sync in progress? [IP: 152.195.19.142 443]
build   Prepare to install dependencies 2023-08-18T20:58:25.6842455Z    Hashes of expected file:
build   Prepare to install dependencies 2023-08-18T20:58:25.6843229Z     - Filesize:1126689 [weak]
build   Prepare to install dependencies 2023-08-18T20:58:25.6843916Z     - SHA256:7cee2584ca6d97b2f07018ba4f9c3c473fb4e299ed170968a1f8c99c090cc59f
build   Prepare to install dependencies 2023-08-18T20:58:25.6844669Z     - SHA1:4ee24fac5518a3fcc3702590a0dab32c95484c54 [weak]
build   Prepare to install dependencies 2023-08-18T20:58:25.6845273Z     - MD5Sum:593faff511765d11055c9919bf2e3bf8 [weak]
build   Prepare to install dependencies 2023-08-18T20:58:25.6845774Z    Release file created at: Thu, 17 Aug 2023 19:03:05 +0000
build   Prepare to install dependencies 2023-08-18T20:58:25.6846358Z E: Some index files failed to download. They have been ignored, or old ones used instead.
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rm /etc/apt/sources.list.d/cuda-ubuntu2004-x86_64.list && apt-key del 7fa2af80

Worked for me.

so beside removing the package list not to be fetched any more, I still do not see any solution to this yet.
According to (Updating the CUDA Linux GPG Repository Key | NVIDIA Technical Blog), the “Solution” here is to “Report CDN issue to NVIDIA”.
So I filed a bug here: https://developer.nvidia.com/nvidia_bug/4248852 in case you want to comment to increase pressure/visibility, but I assume nvidia is already aware of this anyway.

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The metadata mismatch issue is now resolved.

Best way to report CDN issue is on GitHub https://github.com/NVIDIA/cuda-repo-management/issues/10

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