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I get this error when I update the system:

W: GPG error: http://ppa.launchpad.net trusty Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 241FE6973B765FAE

is there something to work it out ?

Mohammad
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1 Answers1

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Import the Public Key with the following command. Then update:

sudo apt-key adv --recv-key --keyserver keyserver.ubuntu.com 241FE6973B765FAE