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PPA key no good in Mint Update Manager

When I run Update manager in Linux Mint 21 x64 Cinnamon I get this error.

W: http://ppa.launchpad.net/lutris-team/lutris/ubuntu/dists/jammy/InRelease: Key is stored in legacy trusted.gpg keyring (/etc/apt/trusted.gpg), see the DEPRECATION section in apt-key(8) for details.
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Post this over at the Mint forums - it is only a warning and Lutris will update. On the Mint forums there is a post for 20.1 showing how to solve the issue, but I don’t know if it works for 21.
I have a new install of Mint 21 and have the same issue across a number of ppa’s I normally use, but so far all seem to update (oibaf ppa is my reference for updates as they are released daily).

Messages like this should be posted on mint forums. Good luck with the issue.

Hello,
I’ve got the issue as well after upgrading Mint 20.3 to 21
This post helped me to solve the issue:

Here are the commands I ran, hopes this helps !

sudo apt-key list
sudo apt-key export 4E3EFAE4 | sudo gpg --dearmour -o /usr/share/keyrings/lutris-team-lutris-jammy.gpg
sudo nano /etc/apt/sources.list.d/lutris-team-lutris-jammy.list
sudo apt update
sudo apt-key del 4E3EFAE4
sudo apt update