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GPG error for Debian

GPG error for Debian


Problem

When updating the Debian based system, apt-get may display an error message like:

W: GPG error: http://download.webmin.com sarge Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY D97A3AE911F63C51 

Solution

Type the following commands:

gpg --keyserver pgpkeys.mit.edu --recv-key  D97A3AE911F63C51      
gpg -a --export D97A3AE911F63C51 | sudo apt-key add -
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