

You title says whonix, but the text mentions QubesOS. Which one? This distinction is very important.
Edit: in QubesOS the networking is handled by the sys-net
qube. If the networking icon does not show up in the tray make sure the sys-net qube is started. If it is, check what programs are available for the sys-net qube in the start menu (hopefully some networking software is available. But I dont have QubesOS in front of me so I cannot check) otherwise try and start a terminal in sys-net and run the command nmtui
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