@Dɑvïd You should be able to use it in Artful (17.10). It's provided by
the gnome-tweak-tool
packge. You should be able to install it with
apt
even if you can't install it otherwise. You might have to run
sudo apt update
before
sudo apt install gnome-tweak-tool
. If that doesn't work, then assuming your Internet connection is working, the most likely cause of the problem is that the universe repository component is not enabled.