There is a problem installing on ubuntu

First install some necessary tools:

sudo apt-get update** **sudo apt-get install lsb-release wget gnupg

Then install Gazebo Garden:

sudo wget -O /usr/share/keyrings/pkgs-osrf-archive-keyring.gpg** **echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/pkgs-osrf-archive-keyring.gpg] $(lsb_release -cs) main" | sudo tee /etc/apt/sources.list.d/gazebo-stable.list > /dev/null** **sudo apt-get update** **sudo apt-get install gz-garden

When I type this command “sudo apt-get update”, it told me that the following signature could not be verified because there was no public key: NO_PUBKEY 67170598AF249743

The question lingered all night,help me,please!!!

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help!!! Somebody help me!

I have the same problem. Any solution?