After update to Ubuntu 22.04 running apt update && apt upgrade will produce the following warning:
W: https://repos.insights.digitalocean.com/apt/do-agent/dists/main/InRelease: 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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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
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:
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., https://repos.insights.digitalocean.com/apt/do-agent/dists/main/InRelease), adding a signed-by tag:
deb [arch=amd64 signed-by=/usr/share/keyrings/microsoft.gpg] https://repos.insights.digitalocean.com/apt/do-agent/dists/main/InRelease stable main
Hope that helps!