Ubuntu:Key is stored in legacy trusted.gpg keyring

First run

sudo apt update

If you get message saying "Key is stored in legacy

trusted.gpg keyring like below"

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Reading package lists... Done

Building dependency tree... Done

Reading state information... Done

28 packages can be upgraded. Run 'apt list --upgradable'

to see them.

W: http://archive.neon.kde.org/user/dists/bionic/InRelease:

Key is

stored in legacy trusted.gpg keyring

(/etc/apt/trusted.gpg), see the DEPRECATION

                section in apt-key(8) for details.

Then you can get rid of this message using following

procedure

cd /etc/apt

sudo cp trusted.gpg trusted.gpg.d

Now run

sudo apt update

You will not get "Key is stored in legacy trusted.gpg

keyring like below" message