Signatures couldn’t be verified because the public key is not available

I’m having trouble, while trying to run a docker container with a base ubuntu image. While attempting to RUN apt-get update, I’m getting the following error: W: GPG error: http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY C2518248EEA14886 E: The repository ‘http://ppa.launchpad.net/webupd8team/java/ubuntu trusty InRelease’ is not…

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