The ppa does not support xenial

[hoangtranwork]

As shown here: https://asciinema.org/a/dwnaq1ahqqgusmjmwzfalevv4

sudo apt-add-repository ppa:agronick/relay doesn't work on Xenial. I'm not sure if this is intentional or not.

same here for Loki 0.4.1.

[josephholsten]

similarly, it does not an artful release. Anything we can do to help?

[tbasten]

Ppa Still doesn't work