fix GPG error (docker-archive-keyring.gpg) #269
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file /usr/share/keyrings/docker-archive-keyring.gpg is wrong permissions, cause error: "W: GPG error: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7EA0A9C3F273FCD8"
This command will fix it: "sudo chmod a+r /usr/share/keyrings/docker-archive-keyring.gpg"
source: https://stackoverflow.com/a/68764068