Hello. I’m using Debian testing with KDE Plasma 5.27. I’m experiencing a problem where GTK Flatpaks are not following the chosen GTK theme despite giving them permissions to access .themes and .icons folders found in the home directory. I tried the running the following commands in the terminal:

flatpak override --filesystem=xdg-config/gtk-4.0:ro flatpak override --filesystem=xdg-config/gtk-3.0:ro

I even tried to specify a certain GTK theme to be chosen, that resulted in the flatpak changing to an ugly white-adwaita theme. I should note that this is happening exclusively with GTK Flatpaks, QT Flatpaks and GTK deb packages don’t seem to have this problem. What am I missing here? Any help would be appreciated.

    • med
      3·
      1 year ago

      Apparently there has been a problem with gtk4 apps and theming in flatpak, only supporting adwaita light and dark - only found vague reference to it though, nothing concrete.

      Try

      flatpak-metadata sockets

      To see if you can find the GTK_THEME environment variable.

      You’ve given it permission to access the themes folder, now you need go point it at the themes

      sudo flatpak override --env=GTK_THEME=my-theme 
sudo flatpak override --env=ICON_THEME=my-icon-theme

      Where my-theme is the theme name, e.g. Adwaita-dark

      Apparently the flatseal gui has some functionality to set the theme too! Will check it out tomorrow to see what’s up.