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Hi,</div>
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if you got the following error:</div>
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<div> The following signatures couldn't be verified because the public key is not available: NO_PUBKEY xxxxxx</div>
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<div>just update the APT key:</div>
<div>curl -4 http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/xUbuntu_16.04/Release.key | sudo apt-key add -</div>
<div>(if you are using other version of Debian/Ubuntu, set the correct version)</div>
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<div>and then apt-get update && apt-get upgrade</div>
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<div>regards,</div>
<div>Laszlo Budai</div>
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