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I'm having problem with my touchpad on my laptop. My laptop is Lenovo G40-70. When first I installed Ubuntu 14.04 on my laptop the touchpad is smooth. But after that I did software update from the internet right away.

After the software update, the touchpad becomes weird, really not smooth, hard to control. I tried reinstalling the OS twice. The touchpad becomes smooth again after reinstalling the OS so I guess it's not hardware problem, but it becomes weird again after the software update.

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I installed 14.04 on my asus r704a and had a lot of cursor issues. I found an answer here.

Touchpad issue: jumping cursor while typing (Ubuntu 14.04), syndaemon don't help

Andy wickert's response on answer number 4.

My issue is still present but not as bad as before. Perhaps this will help you too.

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