If you’ve recently upgraded to Ubuntu 22.04, you may be seeing deprecation warnings related to the ZeroTier download site when using
apt commands like this listed below:
W: http://download.zerotier.com/debian/jammy/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.
To fix this warning, you can run this command in the shell.
curl -s http://download.zerotier.com/contact%40zerotier.com.gpg | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/zerotier.com.gpg > /dev/null
Next time you do an
apt update after running the command above, the warning about the zerotier package repository will be gone!