Synaptic touchpads used to support a three finger tap for middle clicking in Ubuntu 10.10 (same as clicking the scroll wheel on a mouse.)
This critical functionality is broken in Ubuntu 11.10
How can I restore middle clicking on a touchpad?
The problem is with the ubuntu patches against xserver-xorg-input-synaptics package.
The solution to the problem is simple - just replace the ubuntu-provided package with one without those patches.
Download the appropriate Debian package from this site (choose your architecture, either i386 or amd64):
Then remove the original package from your system and replace it with the one downloaded. Reboot the system and 3-finger tapping should be working again.
Just found an amazing thing: Taping on the top right corner of the touchpad is like clicking the middle mouse button. I know it's not the same as the triple click and position accuracy is needed :( but it's the closest I could find to triple click.
BTW, clicking on the lower right corner is like clicking the the right mouse button.
You could use a commandline programme called "synclient", which should be already on your system.
where "Tapbutton3" means a Two-Finger Tap, and the 2 is for middle click.
This method only works until restart (or some other mousesettings-program overrides it). To get this functionality permanently, put this in /usr/share/X11/xorg.conf.d/50-synaptics.conf before "EndSection"
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