How to Enable OS X Lion-style ‘Natural Scrolling’ in Ubuntu

OS X Lion introduced natural/reverse scrolling where by “content tracks finger movement”. 
If you’ve ever used a touchscreen smartphone you’ll already be familiar with how this works: you drag down to scroll up; you drag up to scroll down.

‘Natural Scrolling‘ by Charalampos brings reverse scrolling to Ubuntu.


Reverse Scrolling is likely better demonstrated than explained. If you can’t