May you please suggest me with the error occuring when I install grafana on ubuntu

How con I resolve these problem?

W: GPG error: stable InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 8C8C34C524098CB6
W: The repository ‘ stable InRelease’ is not signed.
N: Data from such a repository can’t be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.


Look slike something is up with the public key. Have you tried following this guide?