Thanks for your report.
Please attach the missing information as described here:
https://wiki.ubuntu.com/DebuggingTouchpadDetection#head-31ab8e1c44cc192521d8470f61358f45ab1fe5ce.
** Changed in: xserver-xorg-input-synaptics (Ubuntu)
Assignee: (unassigned) => Pascal De Vuyst (pascal-devuyst)
Status: New => Incomplete
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ButtonPress and ButtonRelease of button 4 are generated by left click of
synaptic touch pad
https://bugs.launchpad.net/bugs/159968
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Bugs, which is the bug contact for Ubuntu.
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