Key is stored in legacy trusted.gpg keyring

apt-key has been deprecated. Here’s a quick one-liner to fix the annoying message during apt-get update . Ideally, you’d want to pluck out each key using apt-key list then apt-key export <id> placing each key in it’s own file under /etc/apt/trusted.gpg.d.

sudo apt-key --keyring /etc/apt/trusted.gpg exportall | \
sudo tee  /etc/apt/trusted.gpg.d/all_keys.asc

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