Unable to install Community Edition on Ubuntu 18.04

I’m trying to install MongoDB on Ubuntu 18.04. I’m following the instructions on here: https://docs.mongodb.com/manual/tutorial/install-mongodb-on-ubuntu/

However I’ve hit the following error when running sudo apt-get update

W: GPG error: MongoDB Repositories bionic/mongodb-org/4.2 Release: The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY 656408E390CFB1F5
E: The repository ‘MongoDB Repositories bionic/mongodb-org/4.2 Release’ is not signed.

Does anyone know how I can fix this?

Please check this link

https://chrisjean.com/fix-apt-get-update-the-following-signatures-couldnt-be-verified-because-the-public-key-is-not-available/

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