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Ubuntu - Keyboard - Get keyboard shortcut used to display overview

gsettings get org.gnome.mutter overlay-key

Usually this is often set to Super_L, which is the left side Windows key.

NOTE: This can also be checked using the Gnome Tweak Tool, select Keyboard and Mouse from the side menu, and check what it says next to Switch between overview and desktop.

To Disable the Windows key

gsettings set org.gnome.mutter overlay-key ''

To set the Windows key to launch the Overview

gsettings set org.gnome.mutter overlay-key ''
gsettings set org.gnome.shell.keybindings toggle-application-view "['Super_L']"

This may work if the above does not. 

gsettings set org.gnome.desktop.wm.keybindings panel-main-menu "['Super_L']"

To set the key to launch the dash to your preference

gsettings set org.gnome.mutter overlay-key 'Alt_R'

To revert to the default

gsettings reset org.gnome.mutter overlay-key
 
gsettings reset org.gnome.shell.keybindings toggle-overview