The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY
NO_PUBKEY : You may receive the following error when running apt-get update in Ubuntu.
root@GrepitOut:~# apt update Ign:1 http://dl.google.com/linux/chrome/deb stable InRelease Get:2 http://security.ubuntu.com/ubuntu xenial-security InRelease [102 kB] . . Reading package lists... Done W: GPG error: https://repo.skype.com/deb stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 1F3045A5DF7587C3 E: The repository 'https://repo.skype.com/deb stable InRelease' is not signed. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. root@GrepitOut:~#
Execute the following commands in terminal to correct this issue.
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys <PUBKEY>
where <PUBKEY> is your missing public key for the repository, here is 1F3045A5DF7587C3
sudo apt-get update
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