Step-by-step – Flatpak Kubuntu 20.04 Installation

Installing

2. 2. Enabling Flatpak Repo

   Then to Add Flatpak Repository for Kubuntu
   Execute:

   sudo add-apt-repository ppa:alexlarsson/flatpak

   And then to Refresh Apt Repos:

   sudo apt update

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.

3. 3. Installing Flatpak

   Finally, to Install Flatpak for Kubuntu Focal
   Simply play:

   sudo apt install flatpak

   Authenticate with the User Admin Pass.
   If Got “User is Not in Sudoers file” then see: How to Enable sudo.
   Again for the Desktop integration run:

   sudo apt install gnome-software-plugin-flatpak

   And with this latest setup on GNOME based you’ll be able to Install Flatpak Apps just Double-clicking on the downloaded flatpakref File.