The best available desktop app for Facebook Messenger. Created for elementary OS. Inspired by this mockup. Many thanks to purple facebook's authors for creating API to communicate with Messenger service.
Enable snaps on Kubuntu and install tdannecy-messenger
Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.