[chirp_users] Can't install chirp on Ubuntu 16.10

[Tom Consodine]

The Chirp repo doesn't seem to work with Ubuntu 16.10.

I get errors:
W: The repository 
'http://ppa.launchpad.net/dansmith/chirp-snapshots/ubuntu yakkety 
Release' does not have a Release file.

E: Failed to fetch 
http://ppa.launchpad.net/dansmith/chirp-snapshots/ubuntu/dists/yakkety/main/binary-amd64/Packages 
  404  Not Found

E: Some index files failed to download. They have been ignored, or old 
ones used instead.

-- 
Tom ND5Y