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?