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On ubuntu 11.10, with Unity desktop:

tapping top-right corner of the touchpad triggers 'Paste'
tapping top-left corner => 'Copy'
tapping bottom-right corner => 'Right-click'

(I've discovered this through experiments).

Obviously, that's intentional. There must be settings for that. I've looked through Settings->Mouse & Compiz Settings Manager but failed.

How do I disable these triggers?

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In terminal, type: synclient RTCornerButton=0. This solved the problem on me.

Execute synclient -l to list all configurations.

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Note that this only disables the paste feature (note the RT). Repeat this step for RBCornerButton, LTCornerButton and LBCornerButton to disable the other functions. Note that this setting does not appear to persist on a reboot according to this. – Wk_of_Angmar Oct 16 '14 at 20:40

Any changes you make with synclient are lost after reboot. To make the solution posted by Cyron permanent, paste the synclient command(s) to a shell script and add the shell script to your Startup Applications in Unity.

Note that the script has to start with #!/bin/bash, and that you may change permissions to executable to work properly.

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I was looking to solve this problem as well. I don't use a mouse; I use touchpad exclusively. My preferred code editor is vim and I was fed up with unintentional copy and pasting while touching the corners of my touchpad. It seems solution is easy:

  1. Go to Applications -> System Tools -> System Settings
  2. Click on Mouse and Touchpad option.
  3. Click to open the Touchpad tab.
  4. Uncheck "Enable mouse clicks with touchpad" option.

That's all! Enjoy.

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This would disable even left click with touchpad, not a good solution. – theharshest Sep 28 '13 at 9:43
Yes, this actually deservers a down click. But since I've got a few of those haunting me for what I considered to be good answers, I won't do it to you. – Dennis Apr 2 '14 at 5:47

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