In computers based on a Debian operating system that uses Linux kernel, error messages similar to NO_PUBKEY may appear. This happens while using the Apt-Get command line tool, and this error is associated with the tool's update feature.
This problem can be solved by simply keying in the appropriate commands.
Solve Apt-get : NO_PUBKEY / GPG Error in Debian
Simply type the following commands, taking care to replace the number below with that of the key that was displayed in the error message:
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