How to fix 'Legacy Keyring' Warning while updating Raspberry Pi

How to fix Legacy Keyring Warning while updating Raspberry Pi

Disclaimer & Credits

I followed the instructions from Fixing “Key is stored in legacy trusted.gpg keyring” Issue in Ubuntu

Warning Message

Since a couple of weeks I was getting a warning when updating my Raspberry Pi:

Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.

Although it was only a warning and updates were running without problems, this is what I did to get rid of the issue:

Instructions

1. Get a list of keys with sudo apt-key list.
2. The key that is causing problems is the one stored under /etc/apt/trusted.gpg.
3. Once you have found the key, copy the last 8 digits of the pub block, without spaces.
4. Export the deprecated key with apt-key and import it using GPG:

sudo apt-key export 90FDDD2E | sudo gpg --dearmour -o /etc/apt/trusted.gpg.d/***<repo-name>***.gpg

Last steps

• You can list the contents of /etc/apt/trusted.gpg.d/ to check that the import was successful.
• Now when you update the repositories the warning message won’t be displayed anymore.