Step-by-step – PlayOnLinux 5 Ubuntu 18.04 Installation

Setting Up

2. 2. Setting Up Flatpak

   How to Install Flatpak on Ubuntu 18.04

   Flatpak Ubuntu 18.04 Installation Guide

   Flatpak Ubuntu 18.04 Setup

3. 3. Installing PlayOnLinux 5 Flatpak

   Then to Install PlayOnLinux 5 Flatpak App on Ubuntu 18.04
   Simply play:

   flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo

   For further Insight see the Flatpak Official Documentation.
   And after:

   flatpak install https://dl.flathub.org/repo/appstream/org.phoenicis.playonlinux.flatpakref

   The Flatpak App Setup do Not need the sudo Command because then it Runs confined into a Sandbox.
   However you’ll be Prompted to Authenticate with your User or Admin Pass.
   Then Confirm the proposed Setup with ‘Enter’ and wait until the App is Downloaded and Installed.