Thanks for your answer,but i already solve the crash problem by using the commands above.The main problem is that: even after the crash problem has been solved,although the tapping process has been worked on the other computers,it doesn't work in my laptop 'Acer5920g'. I can't tap on my touchpad. In addition to these in my opinion: solving this problem on the package is going to be more useful for the inexperienced users. Have nice hacks :)
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