Everything was working but suddenly stopped. I just didn't upgrade my Ubuntu 14.04 for two months. Now when I want to upgrade I get some errors.

First I run sudo apt-get update:

E: GPG error: http://dl.google.com stable InRelease: Clearsigned file isn't valid, got 'NODATA' (does the network require authentication?)

I search for a solution and found this, but now when I try to import the key, I get another error. While importing the key:

wget -q -O - https://dl-ssl.google.com/linux/linux_signing_key.pub | sudo apt-key add -

I get this error:

gpg: no valid OpenPGP data found.

How to solve this problem?

  • What's your GnuPG version? check with gpg --version – radriaanse Oct 1 '14 at 8:47
  • @remyseroos gpg (GnuPG) 1.4.16 – Omid Oct 1 '14 at 8:49
  • 1
    Can you see the key if you just go to the url from your browser? – radriaanse Oct 1 '14 at 8:59
  • @remyseroos Oh, No! I can't see it. Thank you man. Solved! – Omid Oct 1 '14 at 9:05
  • np, Can you please write out your solution/finding as an answer, and mark it solved? – radriaanse Oct 1 '14 at 9:26

The problem was due to the restriction in my country. As @remyseroos suggested me, I tried to open the URL (https://dl-ssl.google.com/linux/linux_signing_key.pub) in my browser and I found out it's not loading properly.

So I just used a proxy and problem solved!

| improve this answer | |
  • My problem too. Which proxy you used? – Afshar Mohebi Jan 1 '15 at 4:38
  • @afsharm Any VPN service should work. – Omid Jul 12 '15 at 11:13

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