Just a question about that black and green Icon which appears on the bottom right of the screen near the clock : it seems linked to the Wifi connexion but I don’t understand why it appears or not ! Thank you
You could check out /usr/share/applications/ with your file manager, search the icons listed and see what your green and black one is called. WICD is indeed green and black on a white background so you could be correct in your assumption.
Never trust anybody who is too sophisticated to own a rubber chicken.