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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
gsdf
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1 Answers1

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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