How to activate super+scroll to zoom?
Solution 1:
First of all you need to install CompizConfig Settings Manager from the Software Centre. Once you've done that then launch it, and find the Enhanced Zoom Desktop plugin.
Here you need to enable the Zoom In and Zoom Out mouse shortcuts. To get the same behaviour as in 10.10 then set Zoom In to Button4 and Zoom Out to Button5.
Be aware that the Unity panel and launcher are not zoomable (this is probably why this functionality was disabled by default). Also the panel shadow may get in the way.
