[ubuntu] Mouse has become inoperative

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http://ubuntuforums.org – My mouse has become inoperative. I can still open and close windows, but within applications... firefox, thunderbird, system software installation, jEdit... the mouse no longer works. I can still get around using the keyboard... but the mouse is easier :) I've retreated from the affected machine to another to write to the forum. The last site I was at before losing the mouse was the site hosting the sugar environment. I was trying to install their software. Don't know if that's significant. I have since removed the older sugar environment I had on my machine... no difference. I removed t (Hardware)