To install Flatpak on Deepin, run the following in a terminal:sudo apt install flatpak
Add the Flathub repository
Flathub is the best place to get Flatpak apps. To enable it, run:flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
Install the Deepin themes
To install light and dark themes, run:flatpak install flathub org.gtk.Gtk3theme.deepin flatpak install flathub org.gtk.Gtk3theme.deepin-dark
To complete setup, restart your system. Now all you have to do is install some apps!