[ubuntu] Problems with scroll button on Lenovo SL500 with ubuntu 9.04

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http://ubuntuforums.org – Just installed ubuntu 9.04 on my Lenovo SL500 laptop. Now the middle scroll button doesn't work, and I have looked around for a fix but it stll doesn't work. (for example I tried this: http://www.mongflex.com/?p=41) Is it because mine is a SL500, not the same as in the example? (Hardware)