After cloning pitivi as mentioned here, I installed flatpak. Now running the command:
sudo apt install gnome-software-plugin-flatpak
I get this message:
gnome-software-plugin-flatpak is already the newest version (3.28.1-0ubuntu4.18.04.12).
and running the following command:
cd pitivi-dev/pitivi && source bin/pitivi-env
I get this message:
You need to install flatpak-builder >= 0.10.0 to be able to use the '/home/snpd/github/pitivi-dev/pitivi/build/flatpak/pitivi-flatpak' script.
You can find some information about how to install it for your distribution at:
* http://flatpak.org/
I do not know what is wrong here, any help or suggestion is appreciated. Thanks.