Download for xenialpup and bionic at:
https://launchpad.net/~alexlarsson/+arc ... /+packages
Download and install ostree, too. Installation may require additional libs from PPM. Successfully installed in xenialpup64 with skype app running through apulse. Istructions how to run flatpak at:
http://murga-linux.com/puppy/viewtopic. ... 106#990106
Apps at:
https://flathub.org/home