In 16.04 there was a button on the dock you could click that would minimize all open applications. Is there a similar button in 18.04?
It looked like this:
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There are threads explaining relatively complex ways to get this looking like it did in Unity, but what I did was go to the Ubuntu Software Center (app store) and just type in "Show Desktop Button" there is a little add on you can install which puts a little house icon on your top panel that you can click on to do exactly what you want :)