[chirp_users] Ubuntu 16

Hi, I booted to a copy of Ubuntu Mate that I have on a thumb drive so I can install Chirp. I've done this on Ubuntu in many different versions of Ubuntu, but I get an error when trying to add the repository. Was Chirp removed from the Zenial repository? I entered: sudo apt-add-repository ppa:dansmith/chirp-snapshots

Thanks.

Glenn