To fix the following issue, type the following commands in a terminal:
Ubuntu: nGinx – Fix “The following signatures couldn’t be verified because the public key is not available: NO_PUBKEY ABF5BD827BD9BF62”
$ wget http://nginx.org/packages/keys/nginx_signing.key $ cat nginx_signing.key | sudo apt-key add - OK $ apt-get update $ apt-get install nginx