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After installing Ubuntu 13.10 I try to install ubuntu-restricted-extras or any software, it shows me:

E: GPG error: http://archive.canonical.com saucy InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication
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marked as duplicate by karel, Eric Carvalho, Paranoid Panda, David Foerster, Charles Green Jun 9 '17 at 3:06

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I am presently bumping into a similar issue with the CRAN repository. I am connected to a home network. – Luís de Sousa Jan 1 '16 at 17:22
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Does the network require authentication?

Actually I had the same issue. This caused by the network proxy and you have to check your network connection settings.

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I get this error if I am some public wifi and have not opened a web browser and agreed to the terms of service. – Bert May 3 '14 at 16:22

protected by Community♦ Dec 29 '13 at 14:30

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