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When my update is complete I am getting an GPG error but I don't know what is GPG.Can someone explain me what is this error and why it has occurred? I know how to fix it but I want to know what is this error ?

the error is:

W: GPG error: https://download.01.org trusty InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A902DDA375E52366
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    Can you post the contents of the error message?
    – cremefraiche
    Dec 12, 2014 at 6:02
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    Could just be a warning that someone's key isn't fully "trusted", if it's not signed by you or someone else you "trust", but would have to see the erorr to know for sure
    – Xen2050
    Dec 12, 2014 at 6:19
  • following this procedure may help you to get ride of that question. if thats what you want
    – Alex Jones
    Dec 12, 2014 at 8:19
  • possible duplicate of How do I fix the GPG error "NO_PUBKEY"?
    – Jens Erat
    Dec 12, 2014 at 8:42
  • No this question is different
    – gsdf
    Dec 12, 2014 at 14:16

1 Answer 1

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This typically happens when you have added a non-ubuntu repository to your apt sources, but you have not imported the public key that matches the signing key that was used to sign the packages in that repository.

You can run the following command in order to import the missing key:

sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A902DDA375E52366
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  • now getting this error Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.MHiCXTRgnn --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/nilarimogard-webupd8.gpg --keyring /etc/apt/trusted.gpg.d/webupd8team-sublime-text-3.gpg --keyserver keyserver.ubuntu.com --recv-keys A902DDA375E52366 gpg: requesting key 75E52366 from hkp server keyserver.ubuntu.com gpg: keyserver timed out gpg: keyserver receive failed: keyserver error
    – gsdf
    Dec 12, 2014 at 7:20
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    are you behind a proxy?
    – Praveen
    Dec 12, 2014 at 14:21
  • yes I am ,is this because of proxy?
    – gsdf
    Dec 12, 2014 at 14:24
  • Looks like something is blocking your access to keyserver.ubuntu.com, so firewall or proxy are likely to blame.
    – BostonHiker
    Dec 12, 2014 at 16:58

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