I have a mouse that I suppose nowadays is quite uncommon, Logitech Usb Marble mouse. There was a question about this specific mouse, however it was too localized as it dealt with Ubuntu 12.04 and older versions and the solution no longer applies. In the question, there was a link to an Ubuntu help page specifically designed for my model mouse, however it hasn't been updated in years and the solutions are no longer compatible with 12.10 and up.
Creating a 50-marblemouse.conf file as directed for earlier versions of Ubuntu causes the system to break. I have to usb boot and delete the offending file before I can run my distribution again.
So the question is, how do I customize my mouse button functions (i.e. pressing the two smaller mouse buttons to simulate a middle mouse button click) on Ubuntu 14.04?