[ubuntu] mouse click not responding issue

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http://ubuntuforums.org – Hi all .. I`m facing issue with mouse click , suddenly my mouse left click stop responding , the right click and the pointer works , and the same exactly thing for the touch pad ,every thing works fine expect left click , I tried to change the mouse the same issue happened , It`s suddenly stop responding , I can not click select ... etc , and suddenly start responding again.. I`m using Ubuntu 11.4 with dell Inspiron N 5010 ... thanks (Hardware)