Installing software with flatpak package on ubuntu

After ubuntu 18.04, you generally encounter problem of installing software on ubuntu because it now supports flatpak and appimage not just dpkg . 

As dpkg doesn't need any software to be installed but for flatpak you need to follow the following steps

1. sudo add-apt-repository ppa:flatpak/stable

2. sudo apt update

    i. if it fails, use following command first

        sudo apt upgrade

4. sudo apt install flatpak

5. sudo apt install gnome-software-plugin-flatpak

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

7. restart the system

8.  just double click the software and install it.

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