<s>[INST] I get the following when running apt update:
Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details

Why is this warning shown, and how can it be fixed? [/INST] The public key used to sign packages in your APT repository is stored in an outdated format. This format, known as the legacy trusted keyring, is no longer recommended for use and is considered deprecated. To fix this warning, you can update the key to the new format using the apt-key command. 

1. Backup your legacy trusted keyring: sudo cp /etc/apt/trusted.gpg /etc/apt/trusted.gpg.bak
2. Remove the legacy trusted keyring: sudo rm /etc/apt/trusted.gpg
3. Import the key into the new format: sudo apt-key add /etc/apt/trusted.gpg.bak
3. Update the package list: sudo apt update </s>