How to install flatpak on ubuntu
Flatpak is the new framework for desktop applications that allows the same app to be installed on different Linux distributions, including different versions.You need to install Flatpak, before you can install applications with Flatpak.
To install flatpak on ubuntu, Open your terminal. To open terminal click the Dash home from unity launcher.And type terminal in the search field. And click Terminal.
Type the below command in the terminal and hit enter to add the alexlarsson/flatpak ppa.
sudo add-apt-repository ppa:alexlarsson/flatpak
Type your ubuntu password and hit enter.
Then press enter to accept the process. Then type below command in terminal and press enter.
sudo apt update
Finally install flatpak by typing this command in terminal.
sudo apt install flatpak
Type Y and hit enter to confirm the installation.
After the successful installation of flatpak restart your ubuntu.