This bug was fixed in the package xserver-xorg-input-synaptics - 1.3.99+git20110116.0e27ce3a-0ubuntu10
--------------- xserver-xorg-input-synaptics (1.3.99+git20110116.0e27ce3a-0ubuntu10) natty; urgency=low
* Ensure touch mask exists before clearing it (LP: #747126) -- Chase Douglas <email address hidden> Fri, 01 Apr 2011 08:40:59 -0400
This bug was fixed in the package xserver- xorg-input- synaptics - 1.3.99+ git20110116. 0e27ce3a- 0ubuntu10
--------------- xorg-input- synaptics (1.3.99+ git20110116. 0e27ce3a- 0ubuntu10) natty; urgency=low
xserver-
* Ensure touch mask exists before clearing it (LP: #747126)
-- Chase Douglas <email address hidden> Fri, 01 Apr 2011 08:40:59 -0400