How do I fix the GPG error NO_PUBKEY?

Recently, I am working with Ubuntu 16.04, and the task was to install multiple PHP version in Virtualmin, however, whenever I run apt-get update, this returns "The following signatures couldn't be verified because the public…

What is systemd?

What is systemd? — provides a standard process for controlling what programs run when a Linux system boots up.  Starting with Ubuntu 15.04, Upstart will be deprecated in favor of Systemd. With Systemd to manage the…

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