Hello guys!!

I have an error when I try to update the system with the Update Manager. I have Trisquel 4.01 (64bit). I can update several packages, but others failed (several times and from weeks ago). Don't know why!
Here's the message I got:

W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://linux-libre.fsfla.org planet Release: The following signatures were invalid: NODATA 2

W: Failed to fetch http://linux-libre.fsfla.org/pub/linux-libre/planet/dists/planet/Release

W: Some index files failed to download, they have been ignored, or old ones used instead.

Is this normal? Thanks!!

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