Linux Equivalent of Windows Ctrl to show Mouse Pointer

Open Terminal and run the following command

gsettings set org.gnome.settings-daemon.peripherals.mouse locate-pointer true

Now if you press ctrl the pointer should be highlighted.

It is possible to find this option in the GNOME Tweaks. Just go to 'Keyboard & Mouse' -> 'Pointer Location' and turn it on/off.

In 20.04, this is a slightly different location now for gsettings to work with.

In 20.04, this is the org.gnome.desktop.interface locate-pointer object. So:

gsettings set org.gnome.desktop.interface locate-pointer true

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