Deepin 20, installer les Flatpaks

Commandes dans le terminal :

sudo apt install flatpak

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

flatpak install flathub org.gtk.Gtk3theme.deepin 
flatpak install flathub org.gtk.Gtk3theme.deepin-dark

un reboot et c'est bon.