Ubuntu/Linux newbie - lost scrolling functionality on IBM Thinkpad?

I just went for it and converted my IBM Thinkpad from Windows to Linux/Ubuntu, which I’ve admired from afar but don’t know too much about. The computer no longer has trackpoint scrolling—scrolling by holding the middle blue button and moving the trackpoint. This fix doesn’t work: https://www.ibm.com/developerworks/mydeveloperworks/blogs/duncanelliot/entry/fixing_thinkpad_trackpoint_scrolling_on_ubuntu_9_045.

Any suggestions? Thanks so much!