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

Question

I have installed gazebo on my ubuntu 22.04 LTS following the steps in https://classic.gazebosim.org/tutorials?tut=install_ubuntu via their alternative installation. I am getting the following error when I try to update the packages using sudo apt update

W: http://packages.osrfoundation.org/gazebo/ubuntu-stable/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.

I have tried deleting the key from apt-key list but it gave me additional warning about unable to very the key, since the public key was missing. Is there a way for fixing this warning?

I have referred the a similar solution at Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead but couldn't solve the problem.

Answer 1

cd /etc/apt

Followed by:

sudo cp trusted.gpg trusted.gpg.d

Now run a sudo apt update The error shouldn't be showing again

Answer 2

Recently, I have came across a blog post, which listed different methods to solve this issue in a more general approach. I have used the third one listed in here. The method is simple but a forceful one, but it worked for me. I would like to quote the words in the blog post

It is a forceful method because we are not converting keys but instead directly moving legacy keys to a trusted folder, , it may be not a wise idea still if you are not finding any other quick way for your Legacy key hen here is the one to use:

simple navigate to the key listing folder by using cd command and then use a cp command. you can use the code snippet given below(taken from the blog post).

cd /etc/apt
sudo cp trusted.gpg trusted.gpg.d

Other possible solutions are also listed in the same and you can check those too!