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After 11.10 > 12.04 upgrade on Thinkpad W520 mouse input broken

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http://askubuntu.com – After upgrading from 11.10 to 12.04 on a Thinkpad W520 system all mouse/pointer input devices (on this machine that includes the so-called 'TrackPoint pointing stick', a 'TouchPad', and, what I actually use, a generic wireless USB mouse) fail to work properly. The pointer is 'stuck' along the left edge of the screen. The pointer can be moved vertically, but not horizontally. Examining /etc/X11/xorg.conf I see that the 'upgrade-manager' has commented out all the traditional configuration for the mouse (and keyboard) with a pointer to /etc/default/console-setup. Looking there, I find nothing th (HowTos)