After Upgrade get warrning on sudo update

After update to Ubuntu 22.04 running apt update && apt upgrade will produce the following warning:

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

what can i do

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August 14, 2022

Hi @rant,

One way to resolve this is to export the GPG key from the deprecated keyring and store it in /usr/share/keyrings. Fortunately, it’s not too difficult.

List existing key

  1. sudo apt-key list

From here, you’ll see the error of the you’ve given and right after it the contents of the file /etc/apt/trusted.gpg.

You’ll need to export the key from there use the following syntax to convert it into a GPG key and save it under the Trusted.gpg.d folder:

  1. sudo apt-key export last-8-copied-digits| sudo gpg –dearmour -o /usr/share/keyrings/key-name.gpg

Where the last-8-copied-digits would be replaced by the last 8 digits of the pub key. Additionally, the /usr/share/keyrings/key-name.gpg file - key-name.gpg should be replaced with the name of the problematic key. Let’s say it was about MySQL. The file will be called mysql-key.gpg. In your case, it should be about Do-agent.

Now we can update our apt source file for the repository (e.g.,, adding a signed-by tag:

deb [arch=amd64 signed-by=/usr/share/keyrings/microsoft.gpg] stable main

Hope that helps!

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