How to fix apt update error NO_PUBKEY 78BD65473CB3BD13
If you encounter this error message during APT update:
apt-no-pubkey-error.txt
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13you need to import the key using
import-apt-key.sh
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 78BD65473CB3BD13
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