Cannot install pyglfw in 16.06 Xenial

[phil294]

Part of sudo ssh install.sh output:

+ sudo apt-get update -qq
W: The repository 'http://ppa.launchpad.net/pyglfw/pyglfw/ubuntu xenial Release' does not have a Release file.
E: Failed to fetch http://ppa.launchpad.net/pyglfw/pyglfw/ubuntu/dists/xenial/main/binary-amd64/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.

Distro:

Distributor ID:	Ubuntu
Description:	Ubuntu 16.04.2 LTS
Release:	16.04
Codename:	xenial

Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
XDG_CURRENT_DESKTOP: XFCE

Consequently, run.sh says ./run.sh: line 5: build/src/rtwg: No such file or directory