GPG error: stable InRelease

0x00 problem description

	When updating apt sources with apt update today, it was exposed thatW: GPG error: stable InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 78BD65473CB3BD13

0x01 problem solving

	问The essence of the problem is that the public key 78BD65473CB3BD13 is missing, just add it.

0x02 specific steps

sudo apt-key adv --keyserver --recv-keys <PUBKEY>

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