Why can't I scroll down with two fingers?

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Tags

1. #solution
2. #synaptics
3. #touchpad
4. #settings
5. #button
6. #appears
7. #device
8. #installed
9. #finger
10. #multifinger
11. #under
12. #enable
13. #click
14. #highlight
15. #scrolling
16. #check
17. #expand
18. #driver
19. #gestures
20. #devices