Precision:
In the meantime, I have managed to install simple-scan
in flatpak version after uninstalled that of the Software Center) and there, from the launch of the application, it tells me the following message:
"Aucun périphérique de numérisation détecté." (No detected scanning device.)
while my printer is properly connected to a USB port on my computer.
Below, the logs when startup the application in a terminal session:
administrateur@solus-budgie ~ $ flatpak run org.gnome.SimpleScan
Gtk-Message: 13:55:21.304: Failed to load module "xapp-gtk3-module"
Gtk-Message: 13:55:21.334: Failed to load module "canberra-gtk-module"
Gtk-Message: 13:55:21.334: Failed to load module "canberra-gtk-module"
administrateur@solus-budgie ~ $
So I uninstalled it and reinstalled the Software Center version while waiting.