I also have this bug, and it seems to be very similar to the that is described
here for archlinux : http://bugs.archlinux.org/task/17037
Apparently, it is besause of xorg-server equals to xserver-xorg on ubuntu...
** Changed in: xorg-server (Ubuntu)
Status: Incomplete => Confirmed
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Mouse has suddenly no contact, till X-Server restart
https://bugs.launchpad.net/bugs/324506
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