Docker Installation Failure (Debian 11.4 amd64 VMware)

I used the following command: apt-get install -y docker.io A set of errors has come up: Err:2 http://ppa.launchpad.net/git-core/ppa/ubuntu kinetic InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A1715D88E1DF1F24 Hit:8 https://packages.cloud.google.com/apt kubernetes-xenial InRelease Reading package lists... Done
W: GPG error: http://ppa.launchpad.net/git-core/ppa/ubuntu kinetic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY A1715D88E1DF1F24 E: The repository 'http://ppa.launchpad.net/git-core/ppa/ubuntu kinetic 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. Sorry,I'm new and dk how to edit properly Thanks for help in advance!