Hello,

I am getting the following warning while updating on ubuntu 20.04

Reading package lists... Done                                                                                                                                                                             
W: GPG error: http://packages.osrfoundation.org/gazebo/ubuntu-stable focal InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 67170598AF249743
E: The repository 'http://packages.osrfoundation.org/gazebo/ubuntu-stable focal InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

although it says it is disabled it seems to be applying the update.