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.