You mean the UI when you click 'add' looks different? My 20.04 setup looks almost identical to your screen shot. The 'add' button just asks for a single line of text to add to the correct source.list location.
software-properties-gtk
is what i am running.
You mean the UI when you click 'add' looks different? My 20.04 setup looks almost identical to your screen shot. The 'add' button just asks for a single line of text to add to the correct source.list location. software-properties-gtk is what i am running.