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After I upgraded to 12.04 LTS my middle mouse button stopped working... it worked fine before the upgrade. I can scroll with the wheel but when i push it down it refuses to work. Can someone tell me how to make my mouse work again?

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the same problem persists with 13.04 – Nick May 25 '13 at 20:16
For me (14.04) it worked initially, but since yesterday it just stopped working. – Domi Oct 22 '14 at 17:36

These instructions guide you through customizing your mouse, including reconfiguring the middle mouse button:

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