OSConfigAgent Error retry.go #525

While installing the OPS Agent I am getting this error continuously (every 15 mins)

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OSConfigAgent Error retry.go:63: Error Applying apt changes, attempt 1, retrying in 1s: error running /usr/bin/apt-get with args ["update"]: exit status 100, stdout: "Hit:1 http://security.debian.org/debian-security buster/updates InRelease
Hit:2 http://deb.debian.org/debian buster InRelease
Hit:3 http://packages.cloud.google.com/apt cloud-sdk-buster InRelease
Hit:4 http://packages.cloud.google.com/apt google-cloud-packages-archive-keyring-buster InRelease
Hit:5 http://packages.cloud.google.com/apt google-compute-engine-buster-stable InRelease
Hit:6 http://deb.debian.org/debian buster-updates InRelease
Hit:7 http://deb.debian.org/debian buster-backports InRelease
Hit:8 https://packages.cloud.google.com/apt google-cloud-monitoring-buster-all InRelease
Hit:9 https://packages.cloud.google.com/apt google-cloud-ops-agent-buster-all InRelease
Get:10 https://deb.nodesource.com/node_12.x buster InRelease [4584 B]
Ign:11 https://download.arangodb.com/arangodb37/DEBIAN InRelease
Get:12 http://ppa.launchpad.net/openjdk-r/ppa/ubuntu groovy InRelease [23.8 kB]
Hit:13 https://adoptopenjdk.jfrog.io/adoptopenjdk/deb buster InRelease
Hit:14 https://download.arangodb.com/arangodb37/DEBIAN Release
Err:12 http://ppa.launchpad.net/openjdk-r/ppa/ubuntu groovy InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EB9B1D8886F44E2A
Reading package lists...
", stderr: "W: GPG error: http://ppa.launchpad.net/openjdk-r/ppa/ubuntu groovy InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY EB9B1D8886F44E2A
E: The repository 'http://ppa.launchpad.net/openjdk-r/ppa/ubuntu groovy InRelease' is not signed.

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