Debian (apt-get) Public keys

“The following signatures couldn’t be verified because the public key is not available”

Try

apt-key add /usr/share/keyrings/debian-archive-keyring.gpg

Then

apt-get update
apt-get install package-name

If that doesn’t work, check that you have the debian-archive-keyring package.

apt-get install debian-archive-keyring



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