What does this mean: "packages cannot be authenticated!"

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muhammed
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Iscritto: 04/13/2013

The terminal gives me that warning when I tried to install pdfjam in Trisquel 7. The terminal offered to install the packages without verification.

What does authenticate/verify mean? Is it authentication/verification by the Trisquel team?

Magic Banana

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Iscritto: 07/24/2010

I think the key to authenticate the package is outdated. Run the following command first:
$ sudo apt-get update

muhammed
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Iscritto: 04/13/2013

Thanks!