postinst: Use wget instead of flatpak

The flatpak call fails during the LMDE7 ISO build.
It looks like gpg or some of its dependencies aren't fully
ready yet when mintinstall gets installed.

Author: clefebvre

debian/postinst

@@ -35,7 +35,9 @@ case "$1" in
     then
         # flatpak remote-add --if-not-exists gnome https://sdk.gnome.org/gnome.flatpakrepo
         # flatpak remote-add --if-not-exists gnome-apps https://sdk.gnome.org/gnome-apps.flatpakrepo
-        flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo || echo "Warning: Could not add flathub remote!"
+        mkdir -p /etc/flatpak/remotes.d
+        wget -O /etc/flatpak/remotes.d/flathub.flatpakrepo https://flathub.org/repo/flathub.flatpakrepo || echo "Warning: Could not preseed flathub remote!"
+        #flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo || echo "Warning: Could not add flathub remote!"
         # Create share dirs for flatpak, they're in XDG_DATA_DIRS already but if they don't exist
         # they won't be monitored by some of the DEs and the first apps installed with Flatpak won't
         # show in the menu until the user logs out.