How do I set focus follows mouse in Ubuntu 17.10 and later with GNOME 3?

I found multiple answers on askUbuntu about this topic. But none of them suites to Ubuntu 17.10. So I need to ask again:

How do I set focus follows mouse in Ubuntu 17.10?

Solution 1:

You may use (GNOME) Tweaks to achieve your goal. If it's not installed, first install it by running

sudo apt install gnome-tweak-tool

Launch Tweaks and go to the Windows section. Select "Sloppy" or "Secondary-Click" under Window Focus.

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Alternatively you may run the following command

gsettings set org.gnome.desktop.wm.preferences focus-mode 'sloppy'

etc.