[Koha] Roadbump in installing system

I want to install Koha on a public server, and I came across a minor roadbump in following the wiki instructions: wget -q -O- https://debian.koha-community.org/koha/gpg.asc | sudo apt-key add - gives output of: gpg: no valid OpenPGP data found. Is this appropriate and to be expected? If not, what should I do? Thanks,